Anal bleeding can be a sign of many different problems. Some causes can be serious, which is why it should be checked out by your doctor. Bright red blood may be seen only on toilet paper or in the toilet bowl after a bowel movement — not mixed freely with the bowel motion. This type of bleeding is usually caused by haemorrhoids piles or anal fissure. Blood mixed into the bowel movement usually means trouble further up from the anus: it may indicate an inflamed rectum or colon large intestine or bowel. This type of bleeding can be caused by a serious condition, and you may have other symptoms as well.