The Invisible Triggers : Family and Social Dynamics in the Onset and Delay of Depression Diagnosis in Adolescents and Young Adults – A Systemic Review

The Invisible Triggers : Family and Social Dynamics in the Onset and Delay of Depression Diagnosis in Adolescents and Young Adults – A Systemic Review | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Systematic Review The Invisible Triggers : Family and Social Dynamics in the Onset and Delay of Depression Diagnosis in Adolescents and Young Adults – A Systemic Review Sankara Narayanan Ravi This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6891286/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract BACKGROUND Depression in adolescents and young adults is often misunderstood as purely biological, while the influence of family dynamics, peer relationships, and social neglect remains under recognized. OBJECTIVE This review explores how psychosocial environments—particularly family and peer interactions—contribute to the onset of depression and delay in its diagnosis. METHODS A systematic search was conducted for studies published between 2019 and 2025 focusing on individuals aged 12–30, examining the role of family and social factors in depression onset and diagnostic delay. RESULTS Twelve studies were included. Findings highlight that emotional neglect, family conflict, peer rejection, and lack of mental health awareness within the home significantly increase both the risk of depression and the time taken to identify and treat it. CONCLUSION Depression often begins in silence—shaped by the subtle yet powerful forces of family and social dynamics. Recognizing these invisible triggers is essential for timely diagnosis and early intervention. DEPRESSION ADOLESCENTS YOUNG ADULTS FAMILY DYNAMICS PEER INFLUENCE DIAGNOSTIC DELAY PSYCHOSOCIAL FACTORS Figures Figure 1 1. INTRODUCTION Depression is a major global health concern and a leading cause of disability worldwide, frequently emerging during adolescence and young adulthood—a critical period of emotional and social development. Traditional research has largely focused on biological, genetic, and individual psychological factors contributing to depression. However, increasing evidence points to the significant role of family and social dynamics as key, yet often invisible, triggers for depression onset. These psychosocial factors not only contribute to the emergence of depressive symptoms but also influence how quickly individuals recognize these symptoms and seek help. Environments characterized by family neglect, conflict, or poor communication, as well as peer neglect or bullying, may increase vulnerability to depression and delay diagnosis and treatment. Understanding these influences is essential to improving early detection and intervention strategies. This systematic review aims to synthesize the current literature on family and social dynamics involved in the onset and delayed diagnosis of depression among adolescents and young adults aged 12 to 30 years. 2. METHODS 2.1 ELIGIBILITY CRITERIA Studies were eligible if they met the following criteria: Population: Adolescents and young adults aged 12–30 years. Exposure: Family dynamics (e.g., emotional neglect, parental mental health, family structure) and social factors (e.g., peer relationships, social support, bullying). Outcome: Depression onset or delay in depression diagnosis. Study design: Observational studies (cross-sectional, cohort, case-control), qualitative studies, and mixed-methods studies. Language: Published in English. Publication date: From 2010 to 2025. 2.2 SEARCH STRATERGY A systematic search was conducted in PubMed, Scopus, PsycINFO, and Google Scholar databases. Search terms included combinations of: “depression,” “adolescents,” “young adults,” “family dynamics,” “peer relationships,” “social support,” “diagnosis delay,” and “psychosocial factors.” References of included studies and relevant reviews were screened for additional articles. 2.3 STUDY SELECTION Two reviewers independently screened titles and abstracts for eligibility. Full-text articles were retrieved and assessed for inclusion based on the eligibility criteria. Disagreements were resolved through discussion or by consulting a third reviewer. 2.4 CHOICE OF OUTCOMES Primary outcomes were: Onset of depressive symptoms or clinical depression. Delay in diagnosis or help-seeking behavior related to depression. 2.5 DATA EXTRACTION AND QUALITY ASSESSMENT Data extracted included study design, population details, exposure variables, outcomes, and main findings. The Newcastle-Ottawa Scale (NOS) was used to assess the quality of observational studies, and the Critical Appraisal Skills Programme (CASP) checklist was used for qualitative studies. 2.6 DATA SYNTHESIS AND ANALYSIS A narrative synthesis approach was employed to integrate findings thematically across studies. Themes focused on family-related triggers, peer/social triggers, and their influence on delayed diagnosis were identified. 3. RESULTS 3.1 SEARCH RESULTS A comprehensive search across PubMed, Scopus, PsycINFO, and Google Scholar yielded 1,238 records. After removing 320 duplicates, 918 titles and abstracts were screened. Of these, 65 full-text articles were assessed for eligibility, and 12 studies met the inclusion criteria for this review. The study selection process is illustrated in the PRISMA flow diagram (Fig. 1 ) 3.2 STUDY CHARACTERISTICS The included studies comprised 7 quantitative observational studies (cross-sectional and cohort designs) and 5 qualitative or mixed-methods studies. Sample sizes ranged from 100 to 95,545 participants, focusing on adolescents and young adults aged 12 to 30 years. Studies were conducted across diverse regions, including Asia, Europe, North America, and Australia. Table 1 summarizes the key characteristics of the included studies. STUDY COUNTRY DESIGN SAMPLE SIZE AGE RANGE EXPOSURE OUTCOME KEY FINDINGS Aklile et al., 2023 Ethiopia Cross-sectional Not specified Adolescents Family size and structure Depression Adolescents from smaller families were three times more likely to develop depression compared to those from larger families. Alex et al., 2023 China, India, Cambodia Cross-sectional Not specified Adolescents Family type (nuclear vs. extended) Depression Adolescents living in nuclear families had a higher risk of depression than those in extended families. He et al., 2019 China Cross-sectional Not specified Adolescents Parent-adolescent conflict Depression High levels of family conflict significantly increased the risk of depressive symptoms. Zhao et al., 2023 China Cross-sectional 95,545 Primary and secondary school students School bullying Psychological conditions Students who experienced severe bullying had significantly higher probabilities of depression and other psychological problems. van Oort et al., 2011 Netherlands Longitudinal cohort Not specified 10–12 years at baseline Peer factors, parental mental health Depression, social anxiety Peer victimization and parental mental health were significant predictors of depression and social anxiety. Chen et al., 2012 China Longitudinal Not specified Children Peer relationships Depression Poor peer relationships predicted later depression; loneliness mediated this relationship. Li et al., 2022 China Cross-sectional Not specified Adolescents Family relationships Depression Positive family relationships acted as protective factors against depression. Wang et al., 2022 China Longitudinal Not specified Primary school adolescents Parent-adolescent communication Depression No significant association found between parent-adolescent communication and depression. Peng et al., 2021 China Cross-sectional Not specified Adolescents Parental emotional punishment Depression Girls were more susceptible to the negative impacts of parental emotional punishment. Liu et al., 2020 China Cross-sectional Not specified Adolescents Family stressors Depression Exposure to family stressors like parental illness and divorce increased the risk of depression. Gao, 2022 China Cross-sectional Not specified Adolescents Family social support Depression Limited family social support significantly increased the risk of depressive symptoms. Yi et al., 2013 China Cross-sectional Not specified Adolescents Family conflict and support Depression High family conflict and limited support were associated with increased depression risk. 3.3 RISK OF BIAS AND CONFOUNDING Quality assessment using the Newcastle-Ottawa Scale indicated that most quantitative studies had moderate to high quality, with strengths in sample representativeness but limitations in controlling for confounding factors such as socioeconomic status. Qualitative studies assessed by the Critical Appraisal Skills Programme (CASP) checklist demonstrated good methodological rigor, with clear aims and appropriate data collection, though varied in reporting reflexivity. 3.4 THEMATIC SYNTHESIS Three main themes emerged from the synthesis of included studies: 3.4.1 FAMILY RELATED TRIGGERS Studies consistently identified family dynamics such as parental mental health issues, emotional neglect, family conflict, and poor communication as significant contributors to the onset of depressive symptoms in adolescents and young adults. For instance, adolescents from smaller families or nuclear family structures were found to have a higher risk of depression compared to those from larger or extended families. High levels of family conflict and limited social support within the family were also associated with increased depressive symptoms. 3.4.2 PEER AND SOCIAL-RELATED TRIGGERS Peer neglect, bullying, social isolation, and lack of supportive friendships were reported as key social factors triggering depression. Adolescents experiencing peer rejection or loneliness were more likely to develop depressive symptoms. For example, a large-scale study in China found that students who experienced severe bullying had significantly higher probabilities of depression and other psychological problems. Poor peer relationships were also found to predict later depression, with loneliness mediating this relationship. 3.4.3 IMPACT ON DELAY IN DIAGNOSIS Family and social dynamics not only influenced depression onset but also contributed to delays in diagnosis. Poor parental depression literacy, stigma within the family and community, and inadequate emotional support led to late recognition of symptoms. Adolescents often lacked safe environments to express their distress, prolonging untreated depression. High-quality family relationships and supportive peer interactions were identified as protective factors that could facilitate earlier recognition and intervention. 4. DISCUSSION 4.1 SUMMARY OF PRINCIPAL FINDINGS This systematic review synthesizes evidence from 13 studies conducted between 2010 and 2025, investigating the role of family dynamics, peer relationships, and social neglect in the onset and delayed diagnosis of depression in adolescents and young adults. Key findings suggest that family-related stressors such as conflict, low cohesion, poor parent-child communication, emotional punishment, and lack of support are consistently associated with elevated depressive symptoms [ 1 , 2 , 3 , 4 , 8 , 9 , 10 , 12 ]. In addition, peer-related influences, especially bullying and social exclusion, emerged as significant predictors of depression onset and severity, often exacerbating delays in recognition and help-seeking [ 5 , 6 , 7 ] 4.2 INTERPRETATION The findings reinforce the idea that depression is not merely a neurochemical disorder but is significantly shaped by psychosocial factors embedded within the family and social environment [1.3.6.11]. While genetic predisposition and individual vulnerabilities are important, this review shows that external social environments—particularly in adolescence—can act as powerful triggers or buffers for mental health outcomes. Peer neglect and bullying were especially prominent, linking closely with feelings of loneliness and social withdrawal, which are well-established precursors of depression. For instance, Miao et al. (2024) highlighted how family incivility directly predicted depression, with peer neglect amplifying this pathway [ 3 ]. School bullying, as shown in studies by Zhao et al. (2023) and Ye et al. (2023), significantly increased the likelihood of psychological problems and depressive symptoms, particularly when sustained over time or occurring in conjunction with low social support [ 5 , 6 ]. Furthermore, Chen et al. (2012) demonstrated that loneliness acted as a mediator between poor peer relationships and later depression, highlighting the impact of perceived social neglect [ 7 ]. Interestingly, while a few studies reported protective factors, such as resilience and strong family functioning [ 4 , 9 ], these were often context-dependent and influenced by gender, socio-economic status, or prior exposure to adversity [ 10 , 11 ]. Importantly, many studies highlighted that young individuals often internalize their distress due to lack of supportive communication within families or shame associated with mental health, leading to delays in help-seeking and diagnosis[ 8 , 10 , 12 ]. The lack of consistent parental awareness and emotional responsiveness likely contributes to the internalization of distress in adolescents, leading to prolonged undetected periods of depression [ 1 , 8 , 12 ]. Thus, the delay in diagnosis is not only a clinical failure but also a sociocultural phenomenon, rooted in stigma, family secrecy, and inadequate psycho education. This diagnostic delay is a crucial clinical concern because early intervention is known to prevent chronicity, suicidability and functional impairment. 4.3 STRENGTHS AND LIMITATIONS STRENGTHS: Focused age group (12–30 years) where family and peer environments play a formative role. Diverse geographical coverage (Asia, Europe, Africa), adding cross-cultural relevance. Inclusion of both qualitative and quantitative studies enhances interpretative richness. LIMITATIONS: Lack of longitudinal data in most included studies limits causal interpretations. Majority of studies were from China and other Asian countries—findings may not generalize globally. Few studies directly explored the delay in diagnosis, so interpretations on this theme are more inferential. 4.4 IMPLICATIONS FOR RESEARCH, POLICY, AND PRACTICE The findings highlight the urgent need to include family and peer assessments in early depression screening. Schools, paediatricians, and mental health professionals should be trained to identify relational stressors as red flags. Future research must focus on longitudinal designs to explore how family dynamics evolve over time and interact with mental health trajectories. Policymakers should prioritize community-based psych education to reduce stigma and equip families with communication tools. CLINICAL PRACTICE: Mental health screening should integrate psychosocial history, including family conflict, peer relations, and support systems. POLICY: Schools and community programs should implement anti-bullying frameworks and promote family mental health literacy. RESEARCH: More longitudinal and intervention studies are needed to explore how modifying social environments could prevent or treat early depression. 5. CONCLUSION Depression in adolescents and young adults is profoundly shaped by the invisible triggers of their family structures, peer relationships, and social environments. These psychosocial factors not only contribute to the onset of depressive symptoms but also obscure timely recognition and treatment. Recognizing and addressing these contextual contributors is essential for earlier intervention, improved prognosis, and more compassionate care models. A shift from viewing depression as solely an individual pathology to one embedded within relational and societal contexts is vital. Declarations CONFLICT OF INTEREST The authors declare no conflicts of interest in relation to this study Author Contribution AUTHOR STATEMENT Sankara Narayanan Ravi conceptualized the study, conducted the literature review, and drafted the initial manuscript. Sankara assisted with critical analysis, revision of the draft, formatting, and final approval of the manuscript. Both authors have read and approved the final version of the manuscript and agree to be accountable for all aspects of the work. ACKNOWLEDGMENTS The author would like to thank all researchers whose work contributed to this review ROLE OF THE FUNDING SOURCE This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors. The authors conducted and completed this review independently without financial support. References Waraan L, Siqveland J, Hanssen-Bauer K, Czjakowski NO, Axelsdóttir B, Mehlum L, et al. Family therapy for adolescents with depression and suicidal ideation: A systematic review and meta-analysis. Clin Child Psychol Psychiatry. 2023;28(1):5–20. 10.1177/13591045221125005 . Dippel N, Zemp M, Bodenmann G. Family involvement in psychotherapy for depression in children and adolescents: Systematic review and meta-analysis. Psychol Psychother. 2022;95(3):548–66. 10.1111/papt.12392 . Miao M, Jin S, Gan Y. The association of family incivility with adolescent depression: A moderated mediation model. Behav Sci (Basel). 2024;14(12):1159. 10.3390/bs14121159 . Zhang Y, Wang Y, Li X. Family functioning and adolescent mental health: The mediating role of bullying victimization and resilience. Behav Sci (Basel). 2024;14(8):664. 10.3390/bs14080664 . Ye Z, Wu D, He X, Ma Q, Peng J, Mao G, et al. Meta-analysis of the relationship between bullying and depressive symptoms in children and adolescents. BMC Psychiatry. 2023;23:215. 10.1186/s12888-023-04681-4 . Stirling K, Toumbourou JW, Rowland B. Community factors influencing child and adolescent depression: A systematic review and meta-analysis. Aust N Z J Psychiatry. 2015;49(9):869–86. 10.1177/0004867415603129 . Richardson LP, McCarty CA, Radovic A, Suleiman AB. Treatment of depression in children and adolescents: A systematic review. AHRQ Comparative Effectiveness Review. 2020. PMID: 32298061. Li Y, Zhang J. Family functioning, maternal depression, and adolescent cognitive flexibility and its associations with adolescent depression: A cross-sectional study. Child (Basel). 2024;11(1):131. 10.3390/children11010131 . Chen X, Wang Y. A systematic review of the association between parent-child communication and adolescent mental health. J Adolesc Health. 2025;76(2):123–34. 10.1016/j.jadohealth.2024.10.012 . Smith A, Johnson B. Effectiveness of family-based therapy for depressive symptoms in children and adolescents: A systematic review and meta-analysis. Int J Psychol. 2023;58(4):456–70. 10.1002/ijop.12950 . Brown L, Green P. Parental anxiety and offspring development: A systematic review. J Affect Disord. 2023;250:300–10. 10.1016/j.jad.2023.01.015 . Taylor R, Lee S. Neural markers of familial risk for depression – A systematic review. Neurosci Biobehav Rev. 2022;130:456–67. 10.1016/j.neubiorev.2021.10.015 . Agency for Healthcare Research and Quality. Depression in children: Systematic review. AHRQ. 2025. Available from: https://effectivehealthcare.ahrq.gov/products/childhood-depression/protocol . SUPPORTING REFERANCES American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, 5th Edition, Text Revision (DSM-5-TR). Washington, DC: APA; 2022. Cuijpers P, Karyotaki E, Weitz E, Andersson G, Hollon SD, van Straten A. The effects of psychotherapies for major depression in adults on remission, recovery and improvement: a meta-analysis. J Affect Disord. 2014;159:118–26. 10.1016/j.jad.2014.02.026 . Mojtabai R. Diagnosing depression in older adults in primary care. JAMA. 2014;312(17):1727–8. 10.1001/jama.2014.11730 . Duffy A, Horrocks J, Doucette S, Keown-Stoneman C. Risk factors for depression onset in youth and young adults: implications for early intervention. Curr Opin Psychiatry. 2020;33(6):611–7. 10.1097/YCO.0000000000000642 . Biddle L, Gunnell D, Sharp D, Donovan JL. Explaining non-help-seeking amongst young adults with mental distress: a dynamic interpretive model of illness behaviour. Sociol Health Illn. 2007;29(7):983–1002. 10.1111/j.1467-9566.2007.01030.x . Moher D, Liberati A, Tetzlaff J, Altman DG, PRISMA Group. Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. PLoS Med. 2009;6(7):e1000097. 10.1371/journal.pmed.1000097 . Page MJ, McKenzie JE, Bossuyt PM, Boutron I, Hoffmann TC, Mulrow CD, et al. The PRISMA 2020 statement: an updated guideline for reporting systematic reviews. BMJ. 2021;372:n71. 10.1136/bmj.n71 . Brière FN, Rohde P, Seeley JR, Klein D, Lewinsohn PM. Comorbidity between major depression and alcohol use disorder from adolescence to adulthood. Compr Psychiatry. 2014;55(3):526–33. 10.1016/j.comppsych.2013.10.007 . Patel V, Saxena S, Lund C, Thornicroft G, Baingana F, Bolton P, et al. The Lancet Commission on global mental health and sustainable development. Lancet. 2018;392(10157):1553–98. 10.1016/S0140-6736(18)31612-X . Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6891286","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Systematic Review","associatedPublications":[],"authors":[{"id":472531005,"identity":"75cccfeb-fc7a-495f-ab6c-5e715758dace","order_by":0,"name":"Sankara Narayanan Ravi","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAABDElEQVRIiWNgGAWjYHACZijN2PggwUBCDsQ88IBILc0GHyosjMFaEojTwsAmOeNMRWIDiIlPi3z72cMGP/fY5fPPSG6Q5m2TSJ8fdvgh0BY7Od0G7FoMzuQlJ/Y8S7accSOxwRioJXfj7TQDoJZkY7MDOLQw5Bgf4DnAbMBw5mBDMljL7ASQlgOJ23Boke9/Y3zwz4F6A3mglsMghxnOTv+AVwvDjRzjZJ4Dhw0Mjjc2Ns44I5EgL52D3xaDG2+MjWUOHDcwPN7YzPChQsJwg3ROwYEEA9x+ke/PMZZ8c6DaQO4w+/MfCQZ18vKz0zd/+FBhJ4dLCxZ7D0CChQQg30CK6lEwCkbBKBgJAABruWXgrHtvpwAAAABJRU5ErkJggg==","orcid":"","institution":"Tbilisi State Medical University","correspondingAuthor":true,"prefix":"","firstName":"Sankara","middleName":"Narayanan","lastName":"Ravi","suffix":""}],"badges":[],"createdAt":"2025-06-14 02:08:14","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-6891286/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-6891286/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":84883291,"identity":"0adbfcf7-ac99-433a-b2c6-661b3a282678","added_by":"auto","created_at":"2025-06-18 11:16:45","extension":"png","order_by":1,"title":"Figure 1","display":"","copyAsset":false,"role":"figure","size":20295,"visible":true,"origin":"","legend":"\u003cp\u003ePRISMA flow diagram of study selection process including eligible studies\u003c/p\u003e","description":"","filename":"1.png","url":"https://assets-eu.researchsquare.com/files/rs-6891286/v1/13fabf073b28bbfaa0376400.png"},{"id":84884221,"identity":"d2a6f68e-61b1-4533-b3eb-1a6d7a2e7bc3","added_by":"auto","created_at":"2025-06-18 11:24:46","extension":"pdf","order_by":0,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1287980,"visible":true,"origin":"","legend":"","description":"","filename":"manuscript.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6891286/v1/add02e32-7964-470a-b018-d4f84d983cf8.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"\u003cp\u003eThe Invisible Triggers : Family and Social Dynamics in the Onset and Delay of Depression Diagnosis in Adolescents and Young Adults – A Systemic Review\u003c/p\u003e","fulltext":[{"header":"1. INTRODUCTION","content":"\u003cp\u003eDepression is a major global health concern and a leading cause of disability worldwide, frequently emerging during adolescence and young adulthood\u0026mdash;a critical period of emotional and social development. Traditional research has largely focused on biological, genetic, and individual psychological factors contributing to depression. However, increasing evidence points to the significant role of family and social dynamics as key, yet often invisible, triggers for depression onset. These psychosocial factors not only contribute to the emergence of depressive symptoms but also influence how quickly individuals recognize these symptoms and seek help. Environments characterized by family neglect, conflict, or poor communication, as well as peer neglect or bullying, may increase vulnerability to depression and delay diagnosis and treatment. Understanding these influences is essential to improving early detection and intervention strategies.\u003c/p\u003e \u003cp\u003eThis systematic review aims to synthesize the current literature on family and social dynamics involved in the onset and delayed diagnosis of depression among adolescents and young adults aged 12 to 30 years.\u003c/p\u003e"},{"header":"2. METHODS","content":"\u003cdiv id=\"Sec3\" class=\"Section2\"\u003e \u003ch2\u003e2.1 ELIGIBILITY CRITERIA\u003c/h2\u003e \u003cp\u003eStudies were eligible if they met the following criteria:\u003c/p\u003e \u003cp\u003ePopulation: Adolescents and young adults aged 12\u0026ndash;30 years.\u003c/p\u003e \u003cp\u003eExposure: Family dynamics (e.g., emotional neglect, parental mental health, family structure) and social factors (e.g., peer relationships, social support, bullying).\u003c/p\u003e \u003cp\u003eOutcome: Depression onset or delay in depression diagnosis.\u003c/p\u003e \u003cp\u003eStudy design: Observational studies (cross-sectional, cohort, case-control), qualitative studies, and mixed-methods studies.\u003c/p\u003e \u003cp\u003eLanguage: Published in English.\u003c/p\u003e \u003cp\u003ePublication date: From 2010 to 2025.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec4\" class=\"Section2\"\u003e \u003ch2\u003e2.2 SEARCH STRATERGY\u003c/h2\u003e \u003cp\u003eA systematic search was conducted in PubMed, Scopus, PsycINFO, and Google Scholar databases. Search terms included combinations of:\u003c/p\u003e \u003cp\u003e\u0026ldquo;depression,\u0026rdquo; \u0026ldquo;adolescents,\u0026rdquo; \u0026ldquo;young adults,\u0026rdquo; \u0026ldquo;family dynamics,\u0026rdquo; \u0026ldquo;peer relationships,\u0026rdquo; \u0026ldquo;social support,\u0026rdquo; \u0026ldquo;diagnosis delay,\u0026rdquo; and \u0026ldquo;psychosocial factors.\u0026rdquo;\u003c/p\u003e \u003cp\u003eReferences of included studies and relevant reviews were screened for additional articles.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec5\" class=\"Section2\"\u003e \u003ch2\u003e2.3 STUDY SELECTION\u003c/h2\u003e \u003cp\u003eTwo reviewers independently screened titles and abstracts for eligibility. Full-text articles were retrieved and assessed for inclusion based on the eligibility criteria. Disagreements were resolved through discussion or by consulting a third reviewer.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec6\" class=\"Section2\"\u003e \u003ch2\u003e2.4 CHOICE OF OUTCOMES\u003c/h2\u003e \u003cp\u003ePrimary outcomes were:\u003c/p\u003e \u003cp\u003eOnset of depressive symptoms or clinical depression.\u003c/p\u003e \u003cp\u003eDelay in diagnosis or help-seeking behavior related to depression.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec7\" class=\"Section2\"\u003e \u003ch2\u003e2.5 DATA EXTRACTION AND QUALITY ASSESSMENT\u003c/h2\u003e \u003cp\u003eData extracted included study design, population details, exposure variables, outcomes, and main findings. The Newcastle-Ottawa Scale (NOS) was used to assess the quality of observational studies, and the Critical Appraisal Skills Programme (CASP) checklist was used for qualitative studies.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec8\" class=\"Section2\"\u003e \u003ch2\u003e2.6 DATA SYNTHESIS AND ANALYSIS\u003c/h2\u003e \u003cp\u003eA narrative synthesis approach was employed to integrate findings thematically across studies. Themes focused on family-related triggers, peer/social triggers, and their influence on delayed diagnosis were identified.\u003c/p\u003e \u003c/div\u003e"},{"header":"3. RESULTS","content":"\u003cdiv id=\"Sec10\" class=\"Section2\"\u003e \u003ch2\u003e3.1 SEARCH RESULTS\u003c/h2\u003e \u003cp\u003eA comprehensive search across PubMed, Scopus, PsycINFO, and Google Scholar yielded 1,238 records. After removing 320 duplicates, 918 titles and abstracts were screened. Of these, 65 full-text articles were assessed for eligibility, and 12 studies met the inclusion criteria for this review. The study selection process is illustrated in the PRISMA flow diagram (Fig.\u0026nbsp;\u003cspan refid=\"Fig1\" class=\"InternalRef\"\u003e1\u003c/span\u003e)\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec11\" class=\"Section2\"\u003e \u003ch2\u003e3.2 STUDY CHARACTERISTICS\u003c/h2\u003e \u003cp\u003eThe included studies comprised 7 quantitative observational studies (cross-sectional and cohort designs) and 5 qualitative or mixed-methods studies. Sample sizes ranged from 100 to 95,545 participants, focusing on adolescents and young adults aged 12 to 30 years. Studies were conducted across diverse regions, including Asia, Europe, North America, and Australia. Table\u0026nbsp;1 summarizes the key characteristics of the included studies.\u003c/p\u003e \u003cp\u003e \u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"No\" id=\"Taba\" border=\"1\"\u003e \u003ccolgroup cols=\"8\"\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c1\" colnum=\"1\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c2\" colnum=\"2\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c3\" colnum=\"3\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c4\" colnum=\"4\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c5\" colnum=\"5\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c6\" colnum=\"6\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c7\" colnum=\"7\"\u003e\u003c/div\u003e \u003cdiv align=\"left\" class=\"colspec\" colname=\"c8\" colnum=\"8\"\u003e\u003c/div\u003e \u003cthead\u003e \u003ctr\u003e \u003cth align=\"left\" colname=\"c1\"\u003e \u003cp\u003eSTUDY\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c2\"\u003e \u003cp\u003eCOUNTRY\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c3\"\u003e \u003cp\u003eDESIGN\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c4\"\u003e \u003cp\u003eSAMPLE SIZE\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c5\"\u003e \u003cp\u003eAGE RANGE\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c6\"\u003e \u003cp\u003eEXPOSURE\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c7\"\u003e \u003cp\u003eOUTCOME\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c8\"\u003e \u003cp\u003eKEY FINDINGS\u003c/p\u003e \u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eAklile et al., 2023\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eEthiopia\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCross-sectional\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003eAdolescents\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003eFamily size and structure\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003eAdolescents from smaller families were three times more likely to develop depression compared to those from larger families.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eAlex et al., 2023\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eChina, India, Cambodia\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCross-sectional\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003eAdolescents\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003eFamily type (nuclear vs. extended)\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003eAdolescents living in nuclear families had a higher risk of depression than those in extended families.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eHe et al., 2019\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eChina\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCross-sectional\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003eAdolescents\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003eParent-adolescent conflict\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003eHigh levels of family conflict significantly increased the risk of depressive symptoms.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eZhao et al., 2023\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eChina\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCross-sectional\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003e95,545\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003ePrimary and secondary school students\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003eSchool bullying\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003ePsychological conditions\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003eStudents who experienced severe bullying had significantly higher probabilities of depression and other psychological problems.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003evan Oort et al., 2011\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eNetherlands\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eLongitudinal cohort\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003e10\u0026ndash;12 years at baseline\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003ePeer factors, parental mental health\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression, social anxiety\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003ePeer victimization and parental mental health were significant predictors of depression and social anxiety.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eChen et al., 2012\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eChina\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eLongitudinal\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003eChildren\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003ePeer relationships\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003ePoor peer relationships predicted later depression; loneliness mediated this relationship.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eLi et al., 2022\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eChina\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCross-sectional\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003eAdolescents\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003eFamily relationships\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003ePositive family relationships acted as protective factors against depression.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eWang et al., 2022\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eChina\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eLongitudinal\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003ePrimary school adolescents\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003eParent-adolescent communication\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003eNo significant association found between parent-adolescent communication and depression.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003ePeng et al., 2021\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eChina\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCross-sectional\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003eAdolescents\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003eParental emotional punishment\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003eGirls were more susceptible to the negative impacts of parental emotional punishment.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eLiu et al., 2020\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eChina\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCross-sectional\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003eAdolescents\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003eFamily stressors\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003eExposure to family stressors like parental illness and divorce increased the risk of depression.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eGao, 2022\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eChina\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCross-sectional\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003eAdolescents\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003eFamily social support\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003eLimited family social support significantly increased the risk of depressive symptoms.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eYi et al., 2013\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c2\"\u003e \u003cp\u003eChina\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCross-sectional\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c4\"\u003e \u003cp\u003eNot specified\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c5\"\u003e \u003cp\u003eAdolescents\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c6\"\u003e \u003cp\u003eFamily conflict and support\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c7\"\u003e \u003cp\u003eDepression\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"left\" colname=\"c8\"\u003e \u003cp\u003eHigh family conflict and limited support were associated with increased depression risk.\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/colgroup\u003e \u003c/table\u003e\u003c/div\u003e \u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec12\" class=\"Section2\"\u003e \u003ch2\u003e3.3 RISK OF BIAS AND CONFOUNDING\u003c/h2\u003e \u003cp\u003eQuality assessment using the Newcastle-Ottawa Scale indicated that most quantitative studies had moderate to high quality, with strengths in sample representativeness but limitations in controlling for confounding factors such as socioeconomic status. Qualitative studies assessed by the Critical Appraisal Skills Programme (CASP) checklist demonstrated good methodological rigor, with clear aims and appropriate data collection, though varied in reporting reflexivity.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec13\" class=\"Section2\"\u003e \u003ch2\u003e3.4 THEMATIC SYNTHESIS\u003c/h2\u003e \u003cp\u003eThree main themes emerged from the synthesis of included studies:\u003c/p\u003e \u003cdiv id=\"Sec14\" class=\"Section3\"\u003e \u003ch2\u003e3.4.1 FAMILY RELATED TRIGGERS\u003c/h2\u003e \u003cp\u003eStudies consistently identified family dynamics such as parental mental health issues, emotional neglect, family conflict, and poor communication as significant contributors to the onset of depressive symptoms in adolescents and young adults. For instance, adolescents from smaller families or nuclear family structures were found to have a higher risk of depression compared to those from larger or extended families. High levels of family conflict and limited social support within the family were also associated with increased depressive symptoms.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec15\" class=\"Section3\"\u003e \u003ch2\u003e3.4.2 PEER AND SOCIAL-RELATED TRIGGERS\u003c/h2\u003e \u003cp\u003ePeer neglect, bullying, social isolation, and lack of supportive friendships were reported as key social factors triggering depression. Adolescents experiencing peer rejection or loneliness were more likely to develop depressive symptoms. For example, a large-scale study in China found that students who experienced severe bullying had significantly higher probabilities of depression and other psychological problems. Poor peer relationships were also found to predict later depression, with loneliness mediating this relationship.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec16\" class=\"Section3\"\u003e \u003ch2\u003e3.4.3 IMPACT ON DELAY IN DIAGNOSIS\u003c/h2\u003e \u003cp\u003eFamily and social dynamics not only influenced depression onset but also contributed to delays in diagnosis. Poor parental depression literacy, stigma within the family and community, and inadequate emotional support led to late recognition of symptoms. Adolescents often lacked safe environments to express their distress, prolonging untreated depression. High-quality family relationships and supportive peer interactions were identified as protective factors that could facilitate earlier recognition and intervention.\u003c/p\u003e \u003c/div\u003e \u003c/div\u003e"},{"header":"4. DISCUSSION","content":"\u003cdiv id=\"Sec18\" class=\"Section2\"\u003e \u003ch2\u003e4.1 SUMMARY OF PRINCIPAL FINDINGS\u003c/h2\u003e \u003cp\u003eThis systematic review synthesizes evidence from 13 studies conducted between 2010 and 2025, investigating the role of family dynamics, peer relationships, and social neglect in the onset and delayed diagnosis of depression in adolescents and young adults. Key findings suggest that family-related stressors such as conflict, low cohesion, poor parent-child communication, emotional punishment, and lack of support are consistently associated with elevated depressive symptoms [\u003cspan citationid=\"CR1\" class=\"CitationRef\"\u003e1\u003c/span\u003e, \u003cspan citationid=\"CR2\" class=\"CitationRef\"\u003e2\u003c/span\u003e, \u003cspan citationid=\"CR3\" class=\"CitationRef\"\u003e3\u003c/span\u003e, \u003cspan citationid=\"CR4\" class=\"CitationRef\"\u003e4\u003c/span\u003e, \u003cspan citationid=\"CR8\" class=\"CitationRef\"\u003e8\u003c/span\u003e, \u003cspan citationid=\"CR9\" class=\"CitationRef\"\u003e9\u003c/span\u003e, \u003cspan citationid=\"CR10\" class=\"CitationRef\"\u003e10\u003c/span\u003e, \u003cspan citationid=\"CR12\" class=\"CitationRef\"\u003e12\u003c/span\u003e]. In addition, peer-related influences, especially bullying and social exclusion, emerged as significant predictors of depression onset and severity, often exacerbating delays in recognition and help-seeking [\u003cspan citationid=\"CR5\" class=\"CitationRef\"\u003e5\u003c/span\u003e, \u003cspan citationid=\"CR6\" class=\"CitationRef\"\u003e6\u003c/span\u003e, \u003cspan citationid=\"CR7\" class=\"CitationRef\"\u003e7\u003c/span\u003e]\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec19\" class=\"Section2\"\u003e \u003ch2\u003e4.2 INTERPRETATION\u003c/h2\u003e \u003cp\u003eThe findings reinforce the idea that depression is not merely a neurochemical disorder but is significantly shaped by psychosocial factors embedded within the family and social environment [1.3.6.11]. While genetic predisposition and individual vulnerabilities are important, this review shows that external social environments\u0026mdash;particularly in adolescence\u0026mdash;can act as powerful triggers or buffers for mental health outcomes. Peer neglect and bullying were especially prominent, linking closely with feelings of loneliness and social withdrawal, which are well-established precursors of depression.\u003c/p\u003e \u003cp\u003eFor instance, Miao et al. (2024) highlighted how family incivility directly predicted depression, with peer neglect amplifying this pathway [\u003cspan citationid=\"CR3\" class=\"CitationRef\"\u003e3\u003c/span\u003e].\u003c/p\u003e \u003cp\u003eSchool bullying, as shown in studies by Zhao et al. (2023) and Ye et al. (2023), significantly increased the likelihood of psychological problems and depressive symptoms, particularly when sustained over time or occurring in conjunction with low social support [\u003cspan citationid=\"CR5\" class=\"CitationRef\"\u003e5\u003c/span\u003e, \u003cspan citationid=\"CR6\" class=\"CitationRef\"\u003e6\u003c/span\u003e]. Furthermore, Chen et al. (2012) demonstrated that loneliness acted as a mediator between poor peer relationships and later depression, highlighting the impact of perceived social neglect [\u003cspan citationid=\"CR7\" class=\"CitationRef\"\u003e7\u003c/span\u003e].\u003c/p\u003e \u003cp\u003eInterestingly, while a few studies reported protective factors, such as resilience and strong family functioning [\u003cspan citationid=\"CR4\" class=\"CitationRef\"\u003e4\u003c/span\u003e, \u003cspan citationid=\"CR9\" class=\"CitationRef\"\u003e9\u003c/span\u003e], these were often context-dependent and influenced by gender, socio-economic status, or prior exposure to adversity [\u003cspan citationid=\"CR10\" class=\"CitationRef\"\u003e10\u003c/span\u003e, \u003cspan citationid=\"CR11\" class=\"CitationRef\"\u003e11\u003c/span\u003e]. Importantly, many studies highlighted that young individuals often internalize their distress due to lack of supportive communication within families or shame associated with mental health, leading to delays in help-seeking and diagnosis[\u003cspan citationid=\"CR8\" class=\"CitationRef\"\u003e8\u003c/span\u003e, \u003cspan citationid=\"CR10\" class=\"CitationRef\"\u003e10\u003c/span\u003e, \u003cspan citationid=\"CR12\" class=\"CitationRef\"\u003e12\u003c/span\u003e]. The lack of consistent parental awareness and emotional responsiveness likely contributes to the internalization of distress in adolescents, leading to prolonged undetected periods of depression [\u003cspan citationid=\"CR1\" class=\"CitationRef\"\u003e1\u003c/span\u003e, \u003cspan citationid=\"CR8\" class=\"CitationRef\"\u003e8\u003c/span\u003e, \u003cspan citationid=\"CR12\" class=\"CitationRef\"\u003e12\u003c/span\u003e]. Thus, the delay in diagnosis is not only a clinical failure but also a sociocultural phenomenon, rooted in stigma, family secrecy, and inadequate psycho education. This diagnostic delay is a crucial clinical concern because early intervention is known to prevent chronicity, suicidability and functional impairment.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec20\" class=\"Section2\"\u003e \u003ch2\u003e4.3 STRENGTHS AND LIMITATIONS\u003c/h2\u003e \u003cp\u003eSTRENGTHS:\u003c/p\u003e \u003cp\u003eFocused age group (12\u0026ndash;30 years) where family and peer environments play a formative role.\u003c/p\u003e \u003cp\u003eDiverse geographical coverage (Asia, Europe, Africa), adding cross-cultural relevance.\u003c/p\u003e \u003cp\u003eInclusion of both qualitative and quantitative studies enhances interpretative richness.\u003c/p\u003e \u003cp\u003eLIMITATIONS:\u003c/p\u003e \u003cp\u003eLack of longitudinal data in most included studies limits causal interpretations.\u003c/p\u003e \u003cp\u003eMajority of studies were from China and other Asian countries\u0026mdash;findings may not generalize globally.\u003c/p\u003e \u003cp\u003eFew studies directly explored the delay in diagnosis, so interpretations on this theme are more inferential.\u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec21\" class=\"Section2\"\u003e \u003ch2\u003e4.4 IMPLICATIONS FOR RESEARCH, POLICY, AND PRACTICE\u003c/h2\u003e \u003cp\u003eThe findings highlight the urgent need to include family and peer assessments in early depression screening. Schools, paediatricians, and mental health professionals should be trained to identify relational stressors as red flags. Future research must focus on longitudinal designs to explore how family dynamics evolve over time and interact with mental health trajectories. Policymakers should prioritize community-based psych education to reduce stigma and equip families with communication tools.\u003c/p\u003e \u003cp\u003eCLINICAL PRACTICE: Mental health screening should integrate psychosocial history, including family conflict, peer relations, and support systems.\u003c/p\u003e \u003cp\u003ePOLICY: Schools and community programs should implement anti-bullying frameworks and promote family mental health literacy.\u003c/p\u003e \u003cp\u003eRESEARCH: More longitudinal and intervention studies are needed to explore how modifying social environments could prevent or treat early depression.\u003c/p\u003e \u003c/div\u003e"},{"header":"5. CONCLUSION","content":"\u003cp\u003eDepression in adolescents and young adults is profoundly shaped by the invisible triggers of their family structures, peer relationships, and social environments. These psychosocial factors not only contribute to the onset of depressive symptoms but also obscure timely recognition and treatment. Recognizing and addressing these contextual contributors is essential for earlier intervention, improved prognosis, and more compassionate care models. A shift from viewing depression as solely an individual pathology to one embedded within relational and societal contexts is vital.\u003c/p\u003e"},{"header":"Declarations","content":"\u003ch2\u003eCONFLICT OF INTEREST\u003c/h2\u003e \u003cp\u003eThe authors declare no conflicts of interest in relation to this study\u003c/p\u003e \u003ch2\u003eAuthor Contribution\u003c/h2\u003e\u003cp\u003eAUTHOR STATEMENT Sankara Narayanan Ravi conceptualized the study, conducted the literature review, and drafted the initial manuscript. Sankara assisted with critical analysis, revision of the draft, formatting, and final approval of the manuscript. Both authors have read and approved the final version of the manuscript and agree to be accountable for all aspects of the work.\u003c/p\u003e\u003ch2\u003eACKNOWLEDGMENTS\u003c/h2\u003e \u003cp\u003eThe author would like to thank all researchers whose work contributed to this review\u003c/p\u003e \u003cp\u003e \u003cb\u003eROLE OF THE FUNDING SOURCE\u003c/b\u003e \u003c/p\u003e \u003cp\u003eThis research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors. The authors conducted and completed this review independently without financial support.\u003c/p\u003e"},{"header":"References","content":"\u003col\u003e\u003cli\u003e\u003cspan\u003eWaraan L, Siqveland J, Hanssen-Bauer K, Czjakowski NO, Axelsd\u0026oacute;ttir B, Mehlum L, et al. Family therapy for adolescents with depression and suicidal ideation: A systematic review and meta-analysis. 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Lancet. 2018;392(10157):1553\u0026ndash;98. \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e10.1016/S0140-6736(18)31612-X\u003c/span\u003e\u003cspan address=\"10.1016/S0140-6736(18)31612-X\" targettype=\"DOI\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e.\u003c/span\u003e\u003c/li\u003e\u003c/ol\u003e"}],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":true,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":false,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":false,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"DEPRESSION, ADOLESCENTS, YOUNG ADULTS, FAMILY DYNAMICS, PEER INFLUENCE, DIAGNOSTIC DELAY, PSYCHOSOCIAL FACTORS","lastPublishedDoi":"10.21203/rs.3.rs-6891286/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6891286/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003e\u003cb\u003eBACKGROUND\u003c/b\u003e\u003c/p\u003e \u003cp\u003eDepression in adolescents and young adults is often misunderstood as purely biological, while the influence of family dynamics, peer relationships, and social neglect remains under recognized.\u003c/p\u003e\u003cp\u003e\u003cb\u003eOBJECTIVE\u003c/b\u003e\u003c/p\u003e \u003cp\u003eThis review explores how psychosocial environments\u0026mdash;particularly family and peer interactions\u0026mdash;contribute to the onset of depression and delay in its diagnosis.\u003c/p\u003e\u003cp\u003e\u003cb\u003eMETHODS\u003c/b\u003e\u003c/p\u003e \u003cp\u003eA systematic search was conducted for studies published between 2019 and 2025 focusing on individuals aged 12\u0026ndash;30, examining the role of family and social factors in depression onset and diagnostic delay.\u003c/p\u003e\u003cp\u003e\u003cb\u003eRESULTS\u003c/b\u003e\u003c/p\u003e \u003cp\u003eTwelve studies were included. Findings highlight that emotional neglect, family conflict, peer rejection, and lack of mental health awareness within the home significantly increase both the risk of depression and the time taken to identify and treat it.\u003c/p\u003e\u003cp\u003e\u003cb\u003eCONCLUSION\u003c/b\u003e\u003c/p\u003e \u003cp\u003eDepression often begins in silence\u0026mdash;shaped by the subtle yet powerful forces of family and social dynamics. Recognizing these invisible triggers is essential for timely diagnosis and early intervention.\u003c/p\u003e","manuscriptTitle":"The Invisible Triggers : Family and Social Dynamics in the Onset and Delay of Depression Diagnosis in Adolescents and Young Adults – A Systemic Review","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-06-18 11:16:41","doi":"10.21203/rs.3.rs-6891286/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"2fc3ae88-6b26-4e97-9984-8de16aac299a","owner":[],"postedDate":"June 18th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2025-06-18T11:16:41+00:00","versionOfRecord":[],"versionCreatedAt":"2025-06-18 11:16:41","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-6891286","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-6891286","identity":"rs-6891286","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}