Endometriosis is a condition defined by the presence of lesions in the pelvis similar to the tissue found inside of the uterus. This "rogue" endometriotic-like tissue most commonly involves the peritoneum—a thin layer of tissue that lines the pelvic structures, the bowel, the bladder, and the ovaries. And while this is all very technical, the reality for most women is a disease that can be like having tens or hundreds of excruciatingly painful blisters covering the inside of the pelvis.
Common endometriosis symptoms include severe pelvic pain and pain during sex, urination, and bowel movements. Other symptoms of endometriosis may include bloating, nausea and vomiting, constipation and diarrhea, fatigue, infertility, and shoulder-tip pain. At this point in time we do not know exactly what causes endometriosis, but several theories have been proposed.