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In approximately one-third of these cases the man is the factor, in one third the woman is the factor, and in the remaining third the infertility is a product of factors on both parts. In many lower-income countries, estimating infertility is difficult due to incomplete information and infertility and childlessness stigmas.
Causes or factors of female infertility can basically be classified regarding whether they are acquired or genetic, or strictly by location.. Although factors of female infertility can be classified as either acquired or genetic, female infertility is usually more or less a combination of nature and nurture.
20-30% percent of infertility cases are due to male infertility, 20–35% are due to female infertility, and 25-40% are due to combined problems. [13] In 10–20% of cases, no cause is found. [13] The most common cause of female infertility is ovulatory problems, which generally manifest themselves by sparse or absent menstrual periods. [60]
Factors generally associated with increased fertility include religiosity, [10] intention to have children, [11] and maternal support. [12] Factors generally associated with decreased fertility include wealth , education, [ 13 ] [ 14 ] female labor participation , [ 15 ] urban residence, [ 16 ] cost of housing, [ 17 ] [ 18 ] intelligence ...
The male infertility crisis is an increase in male infertility since the mid-1970s. [91] The issue attracted media attention after a 2017 meta-analysis found that sperm counts in Western countries had declined by 52.4 percent between 1973 and 2011.
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
About 10–15% of human couples are infertile, unable to conceive.In approximately in half of these cases, the underlying cause is related to the male. The underlying causative factors in the male infertility can be attributed to environmental toxins, systemic disorders such as, hypothalamic–pituitary disease, testicular cancers and germ-cell aplasia.
Tubal factor infertility (TFI) is female infertility caused by diseases, obstructions, damage, scarring, congenital malformations or other factors which impede the descent of a fertilized or unfertilized ovum into the uterus through the fallopian tubes and prevents a normal pregnancy and full term birth.