Many peptic ulcers are caused by infection with a bacterium called Helicobacter pylori ( H. An open sore in the lining of the stomach or duodenum, the upper end of the small intestine. A condition in which fragile, abnormal blood vessels lead to bleeding. Among the more common causes are infections or inflammatory bowel disease.Īngiodysplasia. Fissures are often caused by passing a large, hard stool and can be painful.Ĭolitis. A small cut or tear in the tissue lining the anus similar to the cracks that occur in chapped lips or a paper cut. Usually diverticula don't cause problems, but sometimes they can bleed or become infected.Īnal fissure. Diverticula are small pouches that project from the colon wall. Possible causes of blood in stool include:ĭiverticular disease. Bleeding that happens higher up in the digestive tract may make stool appear black and tarry. At other times it may visible on toilet tissue or in the toilet after a bowel movement as bright red blood. Sometimes the amount of blood is so small that it can only be detected by a fecal occult test (which checks for hidden blood in the stool). Causes of Blood in Stoolīlood in stool means there is bleeding somewhere in your digestive tract. Here's what you need to know about the possible causes of bloody stools and what you - and your doctor - should do if you discover a problem. While blood in stool can signal a serious problem, it doesn't always. Blood in the stool can be frightening, whether you discover it while wiping after a bowel movement or from a test ordered by your health care provider.
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