What is this article about?
According to the World Health Organization, infertility is "a disease of the reproductive system defined by the failure to achieve a clinical pregnancy after 12 months or more of regular unprotected sexual intercourse". There are, of course, many physical and emotional factors that can lead to infertility. It can be caused by problems in either partner and may be primary or secondary in nature. Primary infertility refers to couples who have not become pregnant after at least one year of having intercourse without using contraception. Secondary infertility refers to couples who have been able to get pregnant at least once, but who are now unable to conceive.