The normal menstrual period can be characterized by breast distension, lower abdominal distension, and occasionally diarrhea during menstruation, mainly because: 1. Diarrhea symptoms occur during menstruation in several consecutive menstrual cycles, which is a special manifestation of menstrual syndrome, and the cause of occurrence is mainly related to the change in hormone levels during menstruation, which causes disorders in the function of the gastrointestinal tract, and diarrhea will stop naturally after the end of the menstrual period. If the diarrhea is not serious, no special treatment is needed. 2. If the diarrhea occurs once in a while during menstruation, it is not directly related to menstruation, but is an acute gastroenteritis caused by eating too cold, spicy and stimulating, greasy food, or eating food that is rotten or contaminated with pathogenic microorganisms. Depending on the severity of the diarrhea symptoms, appropriate oral medication or intravenous fluids should be given. Regardless of the cause of menstrual diarrhea symptoms, attention should be paid to proper dietary control.