The reasons for diarrhea in women during menstruation are as follows: First, it may be due to the decline in hormone levels in women during menstruation, or due to eating greasy, unclean food, and indigestion such as bloating and abdominal pain will occur. Secondly, the increased secretion of prostaglandins during menstruation leads to contraction of the uterus, which expels the endometrium from the uterine cavity, and due to the proximity of the uterus to the rectum, the rectum will also be pulled, leading to excessive contraction and diarrhea. Women should pay attention to proper rest during menstruation, eat light, easy-to-digest food, do not eat cold, spicy, stimulating food, and also pay attention to keep warm to avoid diarrhea, which can lead to dehydration and electrolyte disorders in serious cases.