What Causes Infertility?
In men, the problem is usually because of low numbers or poor quality of sperm. Inability to have a proper intercourse is an uncommon but important cause. A woman may have fertility problems because she may not produce eggs regularly (anovulation), if the eggs are less in number (decreased ovarian reserve) or because her fallopian tubes are damaged or blocked and the sperm cannot reach her eggs. For nearly one third of people, no reason can be found for their problem. This is known as unexplained fertility problems.