Endometriosis is a chronic and painful condition. It happens when tissue that normally lines the uterus grows in other places, like the ovaries or fallopian tubes.
Each month, the uterine lining builds up and then sheds through the cervix and then vagina when you get your period. Tissue that's outside your uterus builds up and breaks down, too. But because it has no way to leave your body, it swells up and in some women it causes pain and scars.
The pain and other symptoms can get in the way of your job, social life, and relationships. Endometriosis can also make it harder for you to get pregnant. But there are good treatments to relieve symptoms and help you get your life back.