Endometriosis is a chronic condition characterized by the growth of tissue similar to the endometrium, which lines the inside of the uterus, outside the uterus, typically on pelvic organs. This ectopic tissue responds to hormonal changes like normal endometrium; it thickens, breaks down, and bleeds during the menstrual cycle. However, since this blood has no way to exit the body, it can lead to inflammation, cyst formation, and scar tissue in surrounding tissues. Endometriosis can cause severe and chronic pelvic pain, especially during menstruation, sexual intercourse, bowel movements, and/or urination. It is also a common condition among women experiencing infertility.