The vast majority of people who have diarrhea during the menstrual period do not have diarrhea, but the following factors may have a bearing on it: 1. The majority of symptoms will disappear soon through active treatment. 3, during the menstrual period if you take a certain drug, the side effects of the drug will also appear diarrhea, so read the drug instructions in detail. If the diarrhea is caused by drugs, the phenomenon will disappear naturally after stopping the medication, so the vast majority of diarrhea during the month will not leave the moon disease.