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During the menstrual cycle, the lining of the uterus produces hormones called prostaglandins which stimulate contractions of the uterus. Prostaglandins cause diarrhea in some women.
Etiology: A rapid movement of stool is one of the most common causes of diarrhea. If stool does not stay in the large intestine long enough, evacuation will be watery. Prostaglandins enable this to occur.
Drugs such as ibuprofen and naproxen as well as some prescription drugs inhibit prostaglandin production and help to relieve menstrual cramping, including prevention of diarrhea.
shock-me-sane
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I was asked by a friend why menstrual cramps (for her) often include loose stools. I have no idea. I tried to google on the physiology of this but have come up short.
any ideas?