MD: Hey luis, black stools could mean there is or was some bleeding in the upper GI tract but other things can do it too (like taking pepto bismol). Most GI bleeding stops on its own but should be evaluated. See your doc to check if there is blood in the stool. He/she will take it from there. If you feel very ill or have significant bleeding, go to the hospital, k?
Answered 6/10/2014
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