A 42-year-old member asked:
What kind of sickness causes my diarrhea to be black?
1 doctor answer
Dr. Sidney Vinson answered
26 years experience in Gastroenterology
Blood, pepto bismol (bismuth subsalicylate): Truly black diarrhea is concerning for digested blood and evaluation a doctor is recommended. Dark green diarrhea is more common and related to bile in the stool. Otherwise the color of stool is related to the colon of whatever is consumed. Also, bismuth containing anti-diarrheals (pepto bismol, kaopectate) make stool black.
Answered on Sep 13, 2016
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