Hard 2 say: But there are many other non-blood causes of dark stools (meds, diet, etc) . Fortunately it is easy to tell by bringing a small sample to your md to test for blood. If blood is found a colonoscopy and upper endoscopy could be performed to rule out a source of bleeding. If no blood, may be dietary. See a doctor.
Answered 9/7/2017
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A doctor has provided 1 answer
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