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However, Sonpal stresses that you should never assume your bleeding is just a hemorrhoid and that you should see your doc for an official diagnosis (donât be shyâwe swear, theyâve seen everything!). In some instances, blood in your stool could mean colorectal cancer. Itâs important to note, though, that the amount of blood is often unnoticeable to the regular eyeâso the rule of thumb is prevention, prevention, prevention.
Melena may also be a sign of bleeding within the lower parts of the small intestine or less frequently in the colon if the blood has been present in the stool for a prolonged period of time, which may occur in a person who is constipated. The various causes of melena are discussed further under Dark Blood in Stool.