Diarrhea is actually a very common phenomenon if it occurs during menstruation, but not all people experience it. Three causes are generally considered when diarrhea occurs during menstruation. The first reason is caused by insufficient blood, because during menstruation there will be a lot of bleeding due to menstruation, so that the gastrointestinal tract will have insufficient blood and gas, and the function will be relatively weakened, and the absorption and digestion ability will become poor, so the symptoms of diarrhea will easily appear. The second condition is caused by cold body, because during menstruation, women’s body is cold, usually manifested as cold hands and feet, and the gastrointestinal tract will also be more sensitive, easily stimulated after the symptoms of diarrhea, so this time must pay attention to avoid eating some cold and spicy food. The third condition to consider is endometriosis, the so-called endometriosis means that the tissue inside the uterus has run to the location outside the uterus, causing a series of lesions, such as myometriosis and chocolate cysts, which are also prone to diarrhea symptoms. If diarrhea occurs during menstruation, do not take it lightly, but go to the hospital gynecology department for a timely examination to rule out some pathological problems.