Having endometriosis is tricky business. For many women, it’s something you have to “look forward to” every month. Sometimes friends and family don’t understand the pain you are enduring with your cycle. And sometimes endometriosis is causing abnormalities in your reproductive area, pelvis and gut that you can’t even feel.
As defined by the American Congress of Obstetricians and Gynecologists, endometriosis occurs when the tissue that normally lines the uterus and gets shed during menstrual cycles for some reason is found growing outside the uterus, usually on the ovaries, fallopian tubes or other pelvic structures. In many cases that endometrium -- the lining -- can cause problems such as chronic abdominal pain, pressure or fullness in the pelvis, debilitating menstrual cramps, pain with intercourse and, sadly, infertility, according to ACOG.
https://www.empowher.com/endometriosis/content/endometriosis-can-reach-your-bowel-and-bladder