Usually, there are many causes of bleeding stool, such as hemorrhoids, intestinal polyps, colitis, gastrointestinal cancer, blood disorders and so on. 1. Hemorrhoids: hemorrhoid patients usually have bleeding symptoms during defecation, and usually bright red, mostly when wiping paper towels with blood, some serious cases may appear dripping or spurting blood symptoms. 2. Intestinal polyps: patients with intestinal polyps usually have indigestion, abdominal pain, diarrhea and bleeding caused by blood in the stool and other symptoms, some patients with intestinal polyps may develop cancer. 3. Colitis: patients with colitis usually have symptoms of bleeding in stools, mostly mucus, pus and blood, which may be accompanied by abdominal pain, generalized fatigue and loss of appetite. 4. Gastrointestinal cancer: some gastric cancer patients may cause bleeding in digestive tract due to the damage of blood vessels caused by tumor, which may lead to the symptom of blood in stools, and the phenomenon of black stools may occur when the bleeding volume is large. 5. Blood diseases: patients with systemic diseases such as leukemia, hemophilia or thrombocytopenic purpura may have symptoms of gastrointestinal bleeding due to abnormal blood clotting mechanism, which may lead to blood in stool. In addition, esophagogastric varices, peptic ulcer and other diseases may also lead to bleeding in the stool. Therefore, it is recommended that the patient should consult a doctor in time, complete the examination, make a clear diagnosis and then be treated accordingly.