Endometriosis is a chronic condition that affects more than 5.5 million women in the United States and Canada. About 40% of patients with endometriosis will experience some degree of infertility. (Resolve)
Endometriosis is a disorder of the female reproductive system in which endometrial tissue (the normal lining of the uterus) is found outside the uterine cavity. An estimated three to five million American women of reproductive age suffer from endometriosis. This disease is prevalent in women 30-40 years of age, though it can begin in the late teens and early twenties.
About 40% of patients with endometriosis will experience some degree of infertility.
The relationship between endometriosis and infertility is not completely understood. The primary cause of infertility resulting from endometriosis appears to be a blockage caused by scarring and adhesions in the tubes. These adhesions can prevent the egg and sperm from meeting or prevent the fertilized egg from moving down the tube normally (resulting in an ectopic pregnancy).
Another theory is that infertility associated with mild endometriosis is caused by an autoimmune reaction. It is speculated that tissue from the uterus that implants outside the uterus is viewed as a foreign cell by the woman's body, which then responds with an immune defense reaction.
Another theory is based on the fact that women with endometriosis have more peritoneal fluid and higher prostaglandin levels. The increased prostaglandin production may influence normal tubal function and prevent normal transport of the egg and sperm through the fallopian tube to the uterus.
Other researchers feel that endometriosis can cause a luteal phase defect, which results from low levels of the hormone progesterone or a poor build-up of the uterine lining after ovulation. A luteal phase defect makes it difficult for the fertilized egg to implant.
Some studies report as high as a 36% spontaneous abortion rate in women with endometriosis versus 15% in the normal population.
Other areas being studied are the effect of endometriosis on normal ovarian function and the role of prolactin in endometriosis.
Women with endometriosis often, but not always, have one or more of the following symptoms:
- Dysmenorrhea (painful cramps during menstruation)
- Dyspareunia (painful intercourse)
- Dysfunctional uterine bleeding, including heavy periods or unusual spotting.
- In about 30% of women, there are no symptoms but infertility- I had no symptoms.