The first and most common cause of bleeding in the stool for girls is hemorrhoids, which are varicose veins that generally cause bleeding when there is difficulty in defecating or when abdominal pressure increases, which can easily lead to swelling and rupture of the hemorrhoidal veins. If a girl eats greasy, high-fat food for a long time, and her bowel movements are not smooth, the anal cushion will easily move down, leading to bleeding, which is usually bright red, and the blood does not mix with feces. The second common cause of bleeding stools in girls may be anal fissures, long-term dry stools can easily damage the skin of the anal canal, resulting in fissures, when wiping stools with blood on the surface of the stool, blood is usually not mixed with stool, sometimes accompanied by painful symptoms, the pain will increase when stooling. The third, the girl stool bleeding may also be rectal polyps, rectal adenoma or rectal malignant tumor, erosion of the submucosa blood vessels and lead to blood in the stool, in this case, should actively perform rectal finger diagnosis, if necessary, can be performed anoscopy or colonoscopy.