A 27-year-old male asked:
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i had diarrhoea for 4 days and now my stool is black why is that?

3 doctor answers
Dr. Martin Raff
55 years experience Infectious Disease
Black stools: Although this may be the result of something you have eaten it also suggests the probability that you are bleeding somewhere in your GI tract. Please go now and see a gastroenterologist and have this evaluated. Do not wait to see what is happening. This could become severe. Good luck and hope you are better soon.
Answered on Jun 10, 2014
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Dr. Robert Killian
27 years experience General Practice
Having taken Pepto-Bismal is a very good reason for the black stools and makes the chance that you have a GI bleed very unlikely.
Mar 31, 2014
Dr. John Munshower
29 years experience Family Medicine
HMMM: I do not know, but a black stool could mean blood was in the stool. Best to have a black stool evaluated if it persists.
Answered on Mar 31, 2014
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Dr. Martin Raff
Dr. Martin Raff commented
55 years experience Infectious Disease
Although Pepto-Bismol can produce dark to black stools it would imprudent to ignore more serious possibilities based upon an unproven assumption. Always err on the side of safety. A stool test for occult blood is very inexpensive.
Mar 31, 2014
Dr. Robert Killian
27 years experience General Practice
Having taken Pepto-Bismal is why you have black stools. It is very unlikely that you have a GI bleed.
Mar 31, 2014
Dr. Robert Killian
27 years experience General Practice
Pepto Bismal: Your stool is black because you used pepto bismal. You do not have a GI bleed and do not need to see a physician about this.
Answered on Jun 10, 2014
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1 comment
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1 thank
Dr. Martin Raff
Dr. Martin Raff commented
55 years experience Infectious Disease
Although Pepto-Bismol can produce dark to black stools it would imprudent to ignore more serious possibilities based upon an unproven assumption. Always err on the side of safety. A stool test for occult blood is very inexpensive.
Mar 31, 2014

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Probable: staining from ingestion of pigmented berries/seeds.
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