Bleeding in the stool is not necessarily caused by stomach bleeding. There are two types of causes of bleeding in the stool, one is upper gastrointestinal bleeding and the other is lower gastrointestinal bleeding. Stomach bleeding is a serious upper gastrointestinal bleeding, and blood in stool caused by stomach bleeding is usually dark red in color, and there is no obvious pain during defecation, and the amount of bleeding is not particularly large. Lower gastrointestinal bleeding, on the other hand, is usually bright red in color and the amount of bleeding increases as the extent of the lesion increases. Lower gastrointestinal bleeding includes a variety of anal and rectal lesions, especially hemorrhoids, perianal abscesses, and rectal prolapse. The most common of these symptoms is blood in the stool caused by hemorrhoids, which can lead to dripping blood and blood clots after a bowel movement that is bright red in color and can cause pain and swelling. It is important to be alert to malignant tumors, especially rectal cancer, which can cause severe bleeding in the stool. When patients have bleeding in the stool, they should not be careless and must go to the relevant hospital for examination in time.