There are many reasons for bleeding in the stool, the more common are the following: 1, hemorrhoidal bleeding, blood in the stool or blood dripping after the stool, some patients will also be accompanied by anal itching. 2, ulcerative colitis, pus and blood stools with abdominal pain, the condition of the recurring episodes, the course of the disease is relatively long, so some patients will also be wasted. 3, intestinal tumors caused by bleeding, bleeding will also be accompanied by a change in defecation habits or change in the thickness of the stool. 4, some blood diseases can also cause intestinal bleeding, due to coagulation disorders or platelet reduction. 4, some blood diseases can also cause intestinal bleeding, due to coagulation disorders or thrombocytopenia. Due to the many causes of bleeding, it is better to do clinical examination to confirm the diagnosis.