Infertility is the failure of a couple to conceive a pregnancy after trying to do so for at least one full year. In primary infertility, pregnancy has never occurred. In secondary infertility, one or both members of the couple have previously conceived, but are unable to conceive again after a full year of trying. In women over 35 years old, an evaluation is required after 6 months of unprotected intercourse.
40% of all infertility cases may be attributed to the woman. 40% can be attributed to man, 10% can be where in both the partners contribute to the problem, and 10% of the time the cause is not known and cannot be identified and it is known as unexplained