Blood in the stool without pain may be caused by hemorrhoids, rectal polyps, rectal inflammation and so on. 1. Hemorrhoids: most often seen in internal hemorrhoids, when the internal hemorrhoids from the anus, often a small amount of bleeding, sticking to the surface of the stool, but most of them do not have obvious symptoms of pain, and sometimes lead to jet-like bleeding. 2. Rectal polyps: due to the polyps in the stool for a long time under the stimulation, it is easy to rupture the blood vessels under the mucous membrane, which leads to blood on the surface of the stool, but there is no obvious pain symptoms. 3. Inflammation of the rectum: mostly seen in ulcerative colitis, sometimes lead to blood in the stool, there is no obvious pain in the anal area, but sometimes accompanied by abdominal pain. Blood in the stool is painless and itchy, and it may be caused by other reasons, such as bacillary dysentery, bleeding varices in the esophagogastric fundus, coagulation disorders and other causes. It is recommended to go to the hospital in time, complete the examination, and follow the doctor’s instructions for timely treatment after a clear diagnosis, so as not to delay the condition.