Bleeding from diarrhea, without pain in bright red, mostly considered to be bleeding internal hemorrhoids, rectal polyps and other causes, should be treated promptly. 1. internal hemorrhoid bleeding: internal hemorrhoids are varicose veins in the anal canal, patients with internal hemorrhoids seldom have any discomfort, often can be manifested as a stool with fresh blood, usually painless. 2. Rectal polyps: Rectal polyps are bulging lesions protruding from the surface of the intestinal mucosa into the intestinal lumen, clinically most asymptomatic, but some patients in the stool, feces may rub the surface of the polyp, resulting in polyp bleeding, accompanied by a change in bowel habits, diarrhea, and other symptoms, the phenomenon of diarrhea with fresh blood, and no pain. The bleeding of diarrhea, and painless bright red may also be caused by other reasons, it is recommended that patients go to the hospital in time, by the doctor to clarify the cause of the disease for targeted treatment.