A bowel movement on the bleeding is common in the following cases: a, internal hemorrhoids, internal hemorrhoids is the most common clinical symptoms of bleeding in the bowel movement, due to hemorrhoids for too long, untreated, resulting in gradual bleeding performance. When defecating, the stool is dry, the anus is subjected to greater pressure resulting in internal hemorrhoidal bleeding point congestion is serious and manifested as blood on the paper, dripping blood or even jets of blood, the color is bright red. Second, intestinal polyps, intestinal polyps need to be diagnosed through colorectaloscopy, polyps in severe cases, when defecation by the anal pressure will also be manifested as blood in the stool, often accompanied by diarrhea, abdominal pain and other symptoms. Third, intestinal ulcers, blood in the stool is more common and often have mucus, diarrhea is obvious. Fourth, intestinal tumors, especially malignant tumors, bleeding is often mixed with stool, dark color, clinically bleeding during defecation is common in the above cases, need to clarify the cause of the disease, symptomatic treatment.