What is endometriosis?
Endometriosis is a condition that occurs when the tissue that forms the inner lining of the uterus (endometrium) grows outside of the uterus. This abnormal tissue growth typically occurs within the pelvis, in the ovaries, fallopian tubes, pelvic peritoneum (the lining of the pelvic cavity), uterine ligaments and its outer surface, bladder, intestines, and rectum.
Endometriosis is estimated to affect between 2 and 10 percent of women of reproductive age. In rare cases, endometriosis has been found in girls before they start their period. However, up to half of women who have chronic pelvic pain, especially right before and during their periods, may have endometriosis that goes undiagnosed. Endometriosis can result in a reduced ability to conceive, called subfertility.