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.
[8][9] It occurs in humans and a limited number of other
menstruating 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).
[3] It can also grow on other organs in the pelvic region like the
bowels,
stomach,
bladder, or the
cervix.
[10] Rarely, it can also occur in other parts of the body.
[3]