Endometriosis is a condition where tissue that usually lines the uterus grows outside of the uterus. This tissue can be found on the ovaries, fallopian tubes, and other organs in the pelvic area. Symptoms of endometriosis can include pelvic pain, irregular periods, and difficulty getting pregnant. Endometriosis can cause scarring and adhesions, which can lead to infertility if left untreated. Treatment options for endometriosis include medications to reduce inflammation, hormone therapy, and surgery.