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Why is my diarrhea black?

Gastrointestinal bleeds and medication can cause your diarrhea to appear black, which is called melena. Melena tends to be tar-like in texture and foul-smelling. Certain medications and iron supplements can also cause black stools. It is best to see your doctor for advice about such changes in your stool.

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About this article

Author: Karen McCloskey BHSc
First answered: 17 Sep 2014
Last reviewed: 17 Oct 2018
Rating: 4.7 out of 5
Votes: 639 (Click smiley face below to rate)
Category: Traveler's diarrhea


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