Worry if melena: Melena presents as black-colored stool due to the break-down of blood in your stomach. You may be describing this and, if so suspicious, seek immediate medical attention.
Answered 11/27/2017
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Don't worry: I would not worry so much as think it would be wise to be checked. The presence of dark stool would potentially suggest blood loss in the GI tract, which should be evaluated. A simple test of the stool itself can be done to look for the presence of blood.
Answered 4/12/2016
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