Causes of Infertility



causes of infertility

What causes infertility in men?

Infertility in men is most often caused by:
  • A problem called varicocele (VAIR-ih-koh-seel). This happens when the veins on a man's testicle(s) are too large. This heats the testicles. The heat can affect the number or shape of the sperm.
  • Movement of the sperm. This may be caused by the shape of the sperm. Sometimes injuries or other damage to the reproductive system block the sperm.

Sometimes a man is born with the problems that affect his sperm. Other times problems start later in life due to illness or injury.

What causes infertility in women?

Most cases of female infertility are caused by problems with ovulation. Without ovulation, there are no eggs to be fertilized. Some signs that a woman is not ovulating normally include irregular or absent menstrual periods.

Ovulation problems are often caused by polycystic ovarian syndrome (PCOS). PCOS is a hormone imbalance problem which can interfere with normal ovulation. PCOS is the most common cause of female infertility. Primary ovarian insufficiency (POI) is another cause of ovulation problems. POI occurs when a woman's ovaries stop working normally before she is 40. POI is not the same as early menopause.

How does age affect a woman's ability to have children?

Many women are waiting until their 30s and 40s to have children. In fact, about 20 percent of women in the United States now have their first child after age 35. So age is a growing cause of fertility problems. About one-third of couples in which the woman is over 35 have fertility problems.

Aging decreases a woman's chances of having a baby in the following ways:
  • Her ovaries become less able to release eggs.
  • She has a smaller number of eggs left.
  • Her eggs are not as healthy.
  • She is more likely to have health conditions that can cause fertility problems.
  • She is more likely to have a miscarriage.
How long should women try to get pregnant before calling their doctors?

Most experts suggest at least one year. Women 35 or older should see their doctors after six months of trying. A woman's chances of having a baby decrease rapidly every year after the age of 30.
Some health problems also increase the risk of infertility. So, women should talk to their doctors if they have:
  • Irregular periods or no menstrual periods
  • Very painful periods
  • Endometriosis
  • Pelvic inflammatory disease
  • More than one miscarriage

It is a good idea for any woman to talk to a doctor before trying to get pregnant. Doctors can help you get your body ready for a healthy baby. They can also answer questions on fertility and give tips on conceiving.



Additional Infertility Information