Diseases that cause blood in the stool without pain usually include hemorrhoids, intestinal tumors or ulcerative colitis, etc., which require prompt medical treatment once detected. The phenomenon of bleeding without pain is most likely to be caused by hemorrhoids, especially internal hemorrhoids with bleeding but painless characteristics, of course, may also be caused by mixed hemorrhoids, usually manifested as a drip of blood after stool or feces with the symptom of blood, but the possibility of external hemorrhoids is unlikely, because external hemorrhoids with blood in the stool is relatively rare. Surface erosion of colorectal tumors in the stool may also be friction ulcerated bleeding, but may also be accompanied by mild lower abdominal pain or stool changes in character and so on; ulcerative colitis in the attack period can be accompanied by mucus pus blood stool, which is usually a non-specific inflammatory bowel disease. The appearance of blood in the stool without pain phenomenon, it is recommended to go to the hospital in a timely manner for examination, a clear diagnosis, as soon as possible to give reasonable treatment, to avoid delaying the aggravation of the condition, the body has adverse consequences.