Why are bowel movements painful and bloating worse during my period?

Painful bowel movements and bloating that flare during your cycle are common in endometriosis, especially when disease is deep in the pelvis near the rectum or rectosigmoid, or when inflammation and scarring tether the bowel to nearby structures. Even without endometriosis growing inside the bowel, pelvic lesions can irritate surrounding tissue and nerves, causing cramping, pressure, and the deep, sharp pain some people feel when passing stool. Hormonal cycling can amplify inflammation and swelling, which is why symptoms often peak around bleeding and then ease. Many patients also notice alternating constipation and diarrhea or an endo belly pattern that tracks with their period.

These symptoms are often confusing because standard GI workups (including colonoscopy) can be normal: bowel endometriosis frequently affects the outside of the bowel wall or deeper layers rather than the inner lining that a colonoscopy evaluates. What matters most is mapping the areas your symptoms point to and checking for red flags like cyclical rectal bleeding, escalating severity, or signs of narrowing or obstruction. Our team focuses on a whole-pelvis evaluation and, when appropriate, targeted imaging and surgical planning to confirm what’s driving your bowel pain and bloating and treat it effectively. If you’d like, reach out to schedule a consultation so we can review your symptom pattern and discuss next steps.