Endometriosis

Endometriosis is usually a long-lasting (chronic) disease. When you have endometriosis, the type of tissue that lines your uterus is also growing outside your uterus. The clumps of tissue (called implants) may have grown on your Reference ovaries Opens New Window or Reference fallopian tubes Opens New Window, the outer wall of the uterus, the intestines, or other organs in the belly. In rare cases they spread to areas beyond the belly.

With each menstrual cycle, the implants go through the same growing, breaking down, and bleeding that the uterine lining (endometrium) goes through. This is why endometriosis pain may start as mild discomfort a few days before the menstrual period and then usually is gone by the time the period ends. But if an implant grows in a sensitive area, it can cause constant pain or pain during certain activities, such as sex, exercise, or bowel movements.

Some women have no symptoms or problems. Others have mild to severe symptoms or Reference infertility Opens New Window. There is no way to predict whether endometriosis will get worse, will improve, or will stay the same until Reference menopause Opens New Window.

Infertility problems

Between 20% and 40% of women who are infertile have endometriosis (some have more than one possible cause of infertility).^{Reference 1} Experts don't fully understand how endometriosis causes infertility. It could be that:^{Reference 2}

• Scar tissue (Reference adhesions Opens New Window) may form at the sites of implants and change the shape or function of the ovaries, fallopian tubes, or Reference uterus Opens New Window.
• The endometrial implants may change the chemical and hormonal makeup in the fluid that surrounds the organs in the abdominal cavity (peritoneal fluid). This may change the Reference menstrual cycle Opens New Window or prevent a pregnancy.

Ovary problems

A common complication of endometriosis is the development of a cyst on an ovary. This blood-filled growth is called an Reference ovarian endometrioma Opens New Window or an endometrial cyst. Endometriomas can be as small as 1 mm or more than 8 cm across. The symptoms of an ovarian cyst may be the same as those of endometriosis.

Also, Reference ovarian cancer Opens New Window risk is higher in women with endometriosis.^{Reference 3} This type of ovarian cancer is most commonly seen in women older than 60.

© 1995-2011, Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Reference Terms of Use. Reference How this information was developed to help you make better health decisions.