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Rare causes of rectal bleeding
Rarely, rapid and severe bleeding from the upper gastrointestinal tract (for example, ulcers of the stomach or duodenum) can cause bright red rectal bleeding. Other rare causes include leaking of
larger amounts of blood into the gastrointestinal tract when a blood vessel ruptures. This may occur when an ulcer of the gastrointestinal tract erodes into a nearby artery or when an arterial graft, for example, an aortic graft used to repair an aortic aneurysm, erodes into the gastrointestinal tract. Even more rare is bleeding from a rectal ulcer, or tumors of the small intestine.