Bright red anal bleeding is mainly considered to be caused by trauma, hemorrhoids and anal fissures. 1. Trauma: If the abdomen is subjected to violent collision or extrusion, the intestinal tissue is damaged, can cause blood vessel rupture, will cause anal bleeding bright red volume. 2. hemorrhoids: hemorrhoids are divided into internal hemorrhoids, external hemorrhoids, mixed hemorrhoids, if the condition is more serious or in the process of defecation is too hard, can also cause anal bleeding bright red volume. 3. Anal fissure: If anal fissure occurs, due to the anal soft tissue damage, capillary rupture, will cause pain during defecation, can also cause anal bleeding bright red volume. If the above symptoms occur, the patient needs to consult a doctor for treatment in time, do not delay the condition, otherwise it will lead to further aggravation of the condition, which is detrimental to the health of the body.