Infertility primarily refers to the biological inability of a person, male or female to contribute to conception. There are many biological causes of infertility, including some that medical intervention can treat.
According to World Health Organisation (WHO), infertility is the inability to conceive a child. A couple may be considered infertile if, after two years of regular sexual intercourse without contraception, the woman has not become pregnant (and there is no other reason, such as breastfeeding or postpartum amenorrhoea).
Primary infertility is infertility in a couple who have never had a child. Secondary infertility is failure to conceive following a previous pregnancy. Infertility may be caused by infection in the man or woman, but often there is no obvious underlying cause.
