Abstract
Both primary and secondary infertility affects millions of person’s world over. There are several factors that can contribute to
infertility in women and men however about 1 in 5 cases of infertility are identified as unexplained. There’s a time frame to
fertility in human life span; child bearing age is defined in females but not in males in general. Infertility has significant negative
social impacts particularly on women. Infertility is regarded as a negative force in population dynamics because there is no
biological replacement, and the continuation of human society. Infe rtile couples might experience social and psychological
distress such as depression, anxiety, social isolation, and sexual dysfunction. Infertile couples suffer from an impaired health-
related quality of life. Women in particular are at greater risk of violence, divorce, social stigma, emotional stress, depression,
anxiety and low self -esteem. In women, cause of infertility can include endometriosis, uterine fibroids and thyroid disease.
Men with fertility problems may have a low sperm count or low testosterone. The risk of infertility increases with age.
Keywords
social stigma; quality of life; child bearing age; fertility window; microbiota; y chromosome infertility
Addressing infertility is important
Infertility affects millions of people worldwide. It is estimated that
approximately one in every six people of reproductive age experience
infertility in their lifetime. [1]. Infertility can be primary or secondary.
Primary infertility is when a pregnancy has never been achieved by a person,
and secondary infertility is when at least one prior pregnancy has been
achieved. Infertility has significant negative social impacts on the lives of
infertile couples and particularly women, who frequently
experience violence, divorce, social stigma, emotional stress, depression,
anxiety and low self -esteem in the society and particularly in the family.
Addressing infertility is therefore an important part of realizing the right of
individuals and couples to found a family Infertility may result from an issue
with either male or female or both, or a combination of factors that prevent
pregnancy. [2,3]. Studies have shown that infertile couples
experience significant anxiety and emotional distress. When a round of
fertility treatments proves to be unsuccessful, for instance, women and
couples can experience deep feelings of grief and loss. [4].
There’s a time limit to fertility in human life span. If the menstrual cycle lasts
28 days and the menstrual cycle is clockwork, it's likely that ovulation will
be halfway through the cycle. The fertile window begins on day 10. A
woman more likely get pregnant, if she has sex at least every other day
between days 10 and 14 of the 28 -day menstrual cycle. Generally, females
are most fertile at the time of ovulation, which usually occurs 12 to 14 days
before the next period starts. While ovulation itself only lasts for 12 to 24
hours, most likely to get pregnant in the days before and after ovulation, The
fertilization window is open only for 6 days. If one knows the average
menstrual cycle length, one can work out when to ovulate this is the time of
the month when one most likely to get pregnant. [4-6]. It's unlikely that one
get pregnant just after the period though endocrinological support is there
but ovum is not available for fertilization. (mother). Menopause is a phase
where human females life is associa ted with the permanent, nonpathlogic,
age-associated cessation of ovulation in a strict sence a non -fertile period.
[6]. A released egg life for less than 24 hours. The highest pregnancy rates
have been reported when the egg and sperm join together within 4 to 6 hours
of ovulation. [7]. Here's why sperm can live inside the female reproductive
track for up to 5 days. The fluid in a woman's reproductive tract has all of
the nutrients that sperm need for their survival during that time. That means
the woman can get pregnant via intercourse that happens anywhere from
about 5 days before ovulation until 24 hours afterwards. Women can't
conceive after their menstrual cycles stop usually sometime in the late 40s or
early 50s. [8]. Men produce sperm throughout th eir lives, but women are
born with a set number of eggs that decreases as one ages. [4-6].
Ejaculated sperm are capable Fertilization as long as the sperm remain alive
in the female genital tract. Sperm can also be preserved for decades when
they are cryopreserved. [9]. Therefore, there's a chance of getting pregnant
even if sperm are deposited before ovulation. Once the sperm enters the
reproductive system, it can take about 30-45 minutes to reach the egg. [4,5].
For this, it is important to have a healthy sperm which has the right kind of
motility to reach the egg and fertilize it.
Causes infertility
Infertility is caused in either the male and/or female reproductive systems by
a number of different factors; some are common to both and many of them
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are g ender based, however, sometimes it is not possible to pin point the
causes of infertility. Common risk factors for both male and female
infertility are mentioned below.
Age:
Human female's fertility window is well defined; they cannot conceive
before their menstrual cycle starts and not after menopause. Their fertility
gradually declines as they age, in their mid-30s it drops rapidly. As they age
the physiology of the ovary changes, the quality and quantity of eggs decline.
Due to age fertility of men also decline; though men generally can produce
sperm lifelong, after age 40 motility of sperm changes. More so percentage
of abnormal sperm number also increases in the semen. Therefore, aging man
may be less fertile than younger men. [10].
Use of Tobacco:
Even if either partner smoking tobacco or marijuana there are less chances
of conceiving a baby. Smoke of tobacco and/or marijuana contains toxic
chemicals such as nicotine, cy anide, and carbon monoxide affect adversely
the production of gametes. This means that menopause occurs 1 to 4 years
earlier in women who smoke Male smokers are also suffer with decreased
sperm quality, by the way of lower counts and motility.[11]. Smoking might
also decrease the sperm’s ability to fertilize eggs because of more abnormally
shaped sperm. [12]. And therefore, smoking such substances disrupts blood
vessels in the reproductive organs and causes erectile dysfunction and even
fertility treatment becomes ineffective. More miscarriages are reported in
women who smoke. [11,13].
Use of Alcohol
Alcohol use may also contribute to infertility, in women alcohol interferes
conception or pregnancy; survey indicated no safe levels. Because of
estrogenic effect, in men, heavy alcohol use can decrease sperm count and
motility. [14].
Obesity:
Due to obe sity, one adopts an inactive lifestyle which in turn impair
reproductive function. In obese women, gonadotropin secretion is affected
because of the increased peripheral aromatization of androgens to estrogens
and also endometrial receptivity and implantation Obesity impairs endocrine
function, oocyte and sperm and embryo quality. Pregnancy and live birth
rates are lower, and miscarriage rates are higher in the setting of obesity. In
men due to alteration in the hypothalamic-pituitary-gonadal axis, disruption
of testicular steroidogenesis and metabolic dysregulation take place due to
this hormonal imbalance takes place and spermatogenesis is affected.
Being underweight:
(BMI under 18.5) Women at risk of fertility problems include those with
eating disorders, such as anorexia or bulimia, and those who follow a very
low-calorie or restrictive diet. [16].
Exercise:
A lack of exercise contributes to obesity, which increases the risk of
infertility. Less often, ovulation problems may be associated with frequent
strenuous, intense exercise in women who are not overweight.[17].
Stress:
Fall outs of stress can cause infertility and not the stress per se.
Epidemiological studies show that women with a history of depression are
twice as likely to experience infertility compared to those who do not have
stress of any sort. Another mental condition, anxiety, arises due to
combination of genes and environmental stresses. Anxiety also can prolong
the time needed to achieve pregnancy. We can be fairly c ertain that, even if
stress may impact ovulation or implantation for women trying to conceive
now. [18- 22].
Microbiota:
Altered milieu of endometrial and vaginal microbiota may the hidden cause
of female infertility. Now this factor should also be considered for infertility
treatment. [23].
In the female reproductive system:
Infertility in females may be due to Structural abnormalities such as, tubal
disorders such as blocked fallopian tubes, which are in turn, caused by
untreated sexually transmitted in fections (STIs) or pelvic surgery; uterine
diseases such as, endometriosis (inflammatory) septate uterus (congenital)
fibroids (benign) Sometimes it may be ovarian disorders, such as polycystic
ovarian syndrome and other follicular disorders. [24 -26]. Disorders of the
endocrine system causing imbalances of reproductive hormones PCOS and
menstrual irregularity or severe menstrual cramps and ovulation
irregularities and disorders marked by a hormone imbalance.[27]. The
endocrine system includes hypothalamus a nd the pituitary glands
dysfunctioning due to pituitary cancers and hypopituitarism.
Male infertility may be caused by:
In the male reproductive system, infertility is most commonly caused by
problems in the ejection of semen such as, premature ejaculation, delayed
ejaculation; these can be caused by psychological and physical factors.
Possible psychological causes of delay ed ejaculation are similar to those of
premature ejaculation – for example, relationship problems, stress or
depression Physical causes of delayed ejaculation include: Absence or low
levels of sperm, or abnormal shape (morphology) and movement (motility)
of the sperm obstruction of the reproductive tract causing dysfunctionalities
in the ejection of semen can also be the cause of infertility.[28,29].The
blockage of sperm can occur in the tubes that carry semen (such as
ejaculatory ducts and seminal vesicle s). Blockages are commonly due to
injuries or infections of the genital tract. [30]. Abnormalities in hormones
secretion and production by the pituitary gland, hypothalamus and testicles
are responsible for infertility too. Examples of disorders that resul t in
hormonal imbalance include pituitary or testicular cancers. [31]. Testicular
failure to produce sperm, for example due to varicoceles or medical
treatments that impair sperm -producing cells (such as chemotherapy) or
abnormal sperm function shape and movement of the sperm negatively affect
fertility. For example, the use of anabolic steroids can cause abnormal semen
parameters such sperm count and shape in some cases immune problems in
which own sperm or to proteins in semen act as antigen and make antibodies
against them.[32]. Semen allergy causes a change in skin colour, burning and
swelling where semen contacts the skin or vaginal tissues.[33]. Some people
not only contact points but may have a whole -body response, including
hives, itching and difficulty breathing.
In addition to above mentioned lifestyle factors, environmental pollutants
and toxins can be directly have toxic effects on gametes (eggs and sperm),
resulting in their decreased numbers and poor quality.
Y chromosome Infertility:
Males with Y chromosome infertility usually have no symptoms other than
infertility. A physical examination may reveal small testes in those with
Sertoli cell-only (SCO) syndrome. Y chromosome infertility is a condition
that affects the production of sperm and causes male infertility, which means
it is difficult or impossible for affected men to father children. [34]. Physical
examination is normal in approximately 30% of males with Y chromosome
infertility. [35].
What can be done?
Fertility care includes the prevention, diagnosis and treatment of infertility.
Challenges to fertility arise from genetic abnormalities, infectious or
environmental agents, delayed childbearing, behaviour, and certain diseases
and systems structural abnormalities. Awareness of th e potential risks may
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lead some people to adopting corrective behaviours and maintain fertility.
Plan for infertility prevention, detection, and management medically assisted
reproduction can certainly help in the improvement of the quality of life of
who live with infertility, through better diagnosis, safe and effective
treatment of infertility, and improved access to modern assisted reproductive
technologies Equal and equitable access to fertility.[36].
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