There are many reasons for bleeding when a woman has a bowel movement, the first one being anal fissures, such as fissures in the rectal mucosa or anal canal caused by difficult or dry stools, which can lead to blood in the stool. The second one may be mixed hemorrhoids, for example, when women are constipated or have difficulty in defecating, the hemorrhoid nucleus is easily aggravated by stagnation, the hemorrhoid nucleus is congested, and even the hemorrhoid vein ruptures and causes bleeding. Thirdly, it may be a rectal polyp or rectal adenoma, for example, the stimulation of feces during stool tends to cause the polyp to rupture and bleed. Another reason is less common, it may be a malignant tumor of the rectum, if the tumor invades the mucosa and the blood vessels under the mucosa under the stimulation of stool, it tends to make the surface of the stool with blood. Therefore, there are especially many causes of bleeding in the stool of girls, and rectal examination should be performed, and if necessary, anoscopy or colonoscopy should be performed to clarify the bleeding site as well as the cause.