In the case of diarrhea during menstruation, you need to consider two possibilities: 1, belong to physiological changes, because during menstruation the female body will release a large number of prostaglandins, and the pelvic cavity is in a state of congestion. Prostaglandins and pelvic congestion, will stimulate the cause of intestinal spasm, thus affecting the digestive function of the intestines, will cause diarrhea, abdominal pain and other symptoms of gastrointestinal dysfunction. 2, if the diet is not hygienic infected with acute gastroenteritis, can also cause diarrhea. If it is because of the physiological diarrhea caused by menstruation, generally do not need special treatment. It is recommended to eat a light diet, you can also eat the appropriate regulation of intestinal function of the drug, such as probiotics. If it is because of gastroenteritis caused by diarrhea, it is recommended to go to the hospital, need to do blood routine stool routine, etc., and at the same time, under the guidance of the doctor to use antidiarrheal, treatment of gastroenteritis drugs.