Endometriosis: Incidence, Causes, and Treatments Endometriosis is a female reproductive organ disease that affects about 10% of women (of the reproductive age) globally. The condition is defined by the growth of endometrial tissue outside of the uterus. These ectopic areas of endometrial tissue contain endometrial glands. Endometriosis usually occurs in the pelvic region, but it can also occur in other areas inside the abdomen, such as on the intestinal wall, bladder, or lining of the abdomen. This…