“Endometriosis happens when the lining of the uterus (womb) grows outside of the uterus. It may affect more than 11% of American women between 15 and 44.1 It is especially common among women in their 30s and 40s and may make it harder to get pregnant. Several different treatment options can help manage the symptoms and improve your chances of getting pregnant.”
U.S. Department of health and human services (womenshealth.gov)