What is the chance that endometriosis will show up somewhere else in my body?

Possible, but rare: Endometriosis is a serious problem in which little pieces of tissue (similar to the uterine lining that bleeds and sheds each month) are trapped inside one's pelvis and abdomen. Rarely, women may have tissue trapped in the chest or other places. With each menstrual period, the trapped tissue sheds and bleeds on the inside of the abdomen (the blood has no way to leave the body), causing much pain.

Low: Benign condition, usually maintained in the abdomen and pelvis. Some rare embolism to the lungs with bleeding or pneumothorax.