If you have diarrhea every time you have your period, it is mainly due to vaginal bleeding caused by the shedding of the endometrium during menstruation. When the endometrium is shed, it secretes a certain amount of prostaglandins, and the amount of prostaglandins secreted during menstruation varies from woman to woman due to individual differences. Some people are relatively low, some are relatively high, and some are relatively sensitive to prostaglandins. So prostaglandins will not only cause contraction of the smooth muscle of the uterus, but also of the smooth muscle of the gastrointestinal tract, which will speed up gastrointestinal motility and lead to diarrhea. It is recommended to eat easily digestible food when you have your period to reduce the burden on your gastrointestinal tract, don’t eat sour and spicy stimulating food, and don’t eat greasy food. It is recommended to drink more Huai Shan soup or make porridge with Huai Shan to strengthen the spleen and stomach during menstruation, which will relieve the symptoms of diarrhea.