The causes of fresh blood from the anus are as follows: First, if it is a small amount of fresh blood, consider that the body is on fire, eaten food and dry, the discharge of dry stool constantly friction stimulates the mucosa near the perianal area, thus causing the small blood vessels near the mucosa to rupture and bleed. Second, the main is the anal opening of hemorrhoids, hemorrhoids is the perianal mucosa near the constant flexion of the formation of venous mass, after the inflammatory stimulation of the perianal area, hemorrhoid venous mass will rupture resulting in bleeding. Third, mainly anal fissure rupture, proctitis, perianal abscess and other diseases can cause small blood vessels near the anus to rupture and bleed. Fourth, if there is a lot of bleeding or there is more than bleeding in defecation, most of them are caused by ruptured bleeding from rectal cancer, colon cancer, upper gastrointestinal tract, liver and low esophagus of stomach.