What are the causes of infertility in human beings?

Explanation

Inability to conceive or produce children evan after unprotected sexual cohabitation is called infertility.
Causes of infertility:
(i) Pelvic inflammatory disease (PID), uterine fibroids and endometriosis are the most common causes of infertility in women.
(ii) Low body fat or anorexia in women i.e. a psychiatric eating disorder characterised by the fear of gaining weight.
(iii) Under developed ovaries or testes.