Why do bowel symptoms get worse during my period?

Many people notice bowel symptoms flare during their period because hormonal shifts affect gut movement and pelvic nerve sensitivity, while prostaglandins released around bleeding increase intestinal contractions and fluid shifts, causing cramping, urgency, and looser stools. These changes can occur without endometriosis, and constipation or accumulated stool can add pelvic pressure and make menstrual cramps feel worse.

With endometriosis, hormonal cycling can amplify inflammation and swelling around lesions near the rectum or rectosigmoid, irritating surrounding tissue and nerves and causing deep, sharp pain with bowel movements even without disease growing into the bowel; symptoms may peak around bleeding and then ease. Scarring and adhesions can tether the bowel so that uterine contractions pull on it, while ongoing inflammation and protective pelvic floor tightening can contribute to slower transit, constipation, alternating diarrhea, and cyclical bloating often called endo belly. A normal GI workup, including colonoscopy, does not rule out bowel endometriosis because it often affects the outer bowel surface or deeper layers rather than the inner lining a scope examines.

Symptoms that reliably worsen just before or during bleeding, especially painful bowel movements, rectal pressure, tenesmus (a persistent urge to pass stool), or cyclical rectal bleeding, raise suspicion for bowel involvement or deep disease behind the uterus; assessment also considers adenomyosis, escalating symptoms, and signs of bowel narrowing or obstruction. Our team uses a whole-pelvis evaluation and targeted imaging when appropriate to guide treatment and surgical planning, which may include minimally invasive excision; relief of bloating and bowel pain also depends on addressing contributors such as constipation and pelvic floor tightening.

If you’d like to explore your symptoms with us, tracking bowel changes across your cycle and bringing that history to a consultation can help our team tailor an assessment and treatment plan.