Bleeding in the stool in large amounts, bright red and without pain is considered to be caused by hemorrhoids, rectal polyps, rectal cancer and other diseases. Bright red blood in the stool is considered to be caused by bleeding from the lower gastrointestinal tract, and hemorrhoids are divided into internal, mixed and external hemorrhoids. Patients with internal hemorrhoids experience rupture due to the varicose veins of the hemorrhoid nuclei being rubbed by feces, and bright red blood is discharged with the stool, bleeding in large amounts without pain, sometimes in the form of jet bleeding. Patients with intestinal polyps have a lot of capillaries on the surface of the swelling tissue due to the protruding bulge of the mucous membrane in the intestine, and the hard feces will rub the capillaries and rupture and bleed, or the swelling will abscess and bleed and be discharged with the stool. In the early stage of rectal cancer, the bleeding is frequent but not much, but in the later stage, it will obstruct the intestinal cavity and cause difficulty in defecation, and when the swelling is rubbed by forceful defecation, bright red blood will be discharged.