Endometriosis, sometimes called "endo," is a common health problem. It gets its name from the word endometrium, the tissue that normally lines the uterus or womb. Endometriosis happens when tissue similar to the lining of the uterus grows outside of your uterus and on other areas in your body where it doesn't belong.
Most often, endometriosis is found on the:
- Fallopian tubes
- Tissues that hold the uterus in place
- Outer surface of the uterus
Other sites for growths can include the vagina, cervix, vulva, bowel, bladder, or rectum. Rarely, endometriosis appears in other parts of the body, such as the lungs, brain, and skin.