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The color of your stool varies for a number of reasons. Some foods (such as black licorice) have a strong black color that will persist even into the stool. Your digestion does not always work in exactly the same way, either, depending upon the level of activity of your intestinal bacteria, for example. A black stool can also indicate some degree of bleeding in the gastrointestinal tract, since the blood turns black (or very dark brown) as it clots. So there is a possibility of an ulcer or other such problem. However, you would probably be experiencing pain, as well as seeing a black stool, if you had an ulcer. I would not jump to any conclusions after a single day of black stool.

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13y ago

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