Bleeding stools are a very common type of problem in daily life. If the stool bleeding stops in a few days, it is mostly considered to be suffering from hemorrhoids or anal fissure, which can be cured by active treatment in general, and the problem is not serious. The main clinical causes of bleeding stools are: 1, gastrointestinal bleeding, mostly caused by gastroduodenal ulcers, intestinal polyps, clinical manifestations are mostly black or dark red stools, may be accompanied by abdominal pain; 2, malignant tumors of the intestinal tract, manifested as persistent black stools or stool characteristics and defecation habits change; 3, local lesions of the anus, such as anal fissures and hemorrhoids, performance is mainly dripping blood after the stool or stool surface The manifestation is mainly blood dripping from the stool or fresh blood attached to the surface of the stool, and there may be severe pain in the anal region during defecation. If there is persistent bleeding, you can go to the regular hospital gastrointestinal surgery to perform colonoscopy for a clear diagnosis, so that the disease can be detected and treated early.