Endometriosis
Endometriosis is a disease in which tissue similar to the endometrium, the lining of the uterus, grows in other places in the body outside the uterus. It occurs in women and a limited number of other female mammals. Endometrial tissue most often grows on or around reproductive organs such as the ovaries and fallopian tubes, on the outside surface of the uterus, or the tissues surrounding the uterus and the ovaries (peritoneum). It can also grow on other organs in the pelvic region like the bowels, stomach, bladder, or the cervix. Rarely, it can also occur in other parts of the body.
Source: Wikipedia
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