Gastrointestinal Symptoms in Diabetes Occur Long Before Diabetic Complications

Background: Gastrointestinal (GI) manifestations are common in patients with diabetes complications such as autonomic neuropathy. However, the prevalence of GI symptoms before the development of diabetes complications remains unclear. Method: We performed an interview survey of functional gastrointestinal disorders in diabetes patients who visited the endocrinology clinic of a general hospital using the ROME III criteria. The investigation consisted of various questions on functional dyspepsia, irritable bowel syndrome, and functional constipation including functional defecation disorder. Results: A total of 509 patients were included in this analysis. The patients were analyzed in three groups, prediabetes patients (n = 115), diabetes patients without neuropathy (n = 275), and diabetes patients with neuropathy (n = 119). The prevalence of gastrointestinal symptoms in prediabetes patients, diabetes patients without neuropathy, and diabetes patients with neuropathy was estimated at 16.52%, 27.27%, and 23.53% for functional dyspepsia; 8.7%, 11.68%, and 16.81% for irritable bowel syndrome; and 8.85%, 11.85%, and 15.25% for functional constipation. In the subgroup analysis, postprandial distress syndrome symptoms such as postprandial fullness and early satiation were more prevalent than epigastric pain symptoms. In the constipation group, pelvic outlet obstruction symptoms such as the sensation of anorectal obstruction or blockage and manual maneuvers to facilitate defecation were more frequently observed than slow transit constipation symptoms Conclusions: : The prevalence of functional gastrointestinal disorders increased with diabetes severity. Diabetes-related GI symptoms appeared long before the diabetes complications