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Definition
By Mayo Clinic staffEndometriosis is a disorder of the female reproductive system. In endometriosis, the endometrium, which normally lines your uterus, grows in other places as well. Most often, this growth is on your fallopian tubes, ovaries or the tissue lining your pelvis.
When endometrial tissue is located elsewhere in your body, it continues to act as it normally would during a menstrual cycle: It thickens, breaks down and bleeds each month. Because there's nowhere for the blood from this displaced tissue to exit your body, it becomes trapped, and surrounding tissue can become irritated.
Trapped blood may lead to cysts, scar tissue and adhesions — abnormal tissue that binds organs together. This process can cause pelvic pain, especially during your period. Endometriosis also can cause fertility problems.
