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A 24-year-old female asked:

Does tetracycline cause dark or black stool?

1 doctor answer4 doctors weighed in
Dr. Lori Semel
Pediatrics 35 years experience
Yes: Tetracycline taken orally can cause dark or black stools.

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A 29-year-old member asked:

Dark brown, but not black stool. What could it be?

1 doctor answer1 doctor weighed in
Dr. Sean O Donovan
Colon and Rectal Surgery 34 years experience
What you ate?: Color of stools varies widely, and reflects mostly what you've eaten as well as some medications. Generally not a reliable sign of anything, but any color can contain hidden blood, so if you're worried, your physician can do a simple hemoccult for hidden blood in the office.
A 35-year-old member asked:

What causes black stool?

1 doctor answer2 doctors weighed in
Dr. Heidi Fowler
Psychiatry 25 years experience
Sometimes it is: caused by things like iron supplementation or Peptobismal. If there is black, tarry malodorous stool it could be GI bleeding and should prompt medical evaluation. Take care.
A 39-year-old member asked:

What is a common cause for black stool?

1 doctor answer3 doctors weighed in
Dr. Eric Kaplan
Colon and Rectal Surgery 42 years experience
Variable: But most concerning is a bleeding site in the upper GI tract which turns black when exposed to gastric acids. This can progress very rapidly to a very serious and life threatening situation. Non serious causes can be any meds containing bismuth such as pepto bismol (bismuth subsalicylate) and certain foods. You should see your doctor promptly for evaluation and referral if indicated.

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Last updated Aug 19, 2020
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