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Woman with menstrual cramps.
Endometriosis can cause infertility, painful periods, and general pelvic pain.Photo: Tom Le Goff / Getty Images
Common endometrial growth sites.
Endometrial growths usually form in the pelvic region, including on or near the ovaries, but they can also appear less commonly near the rectum, the vagina, the fallopian tubes, or even in the urinary tract or gastrointestinal tract.Photo © A.D.A.M.