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A 65-year-old male asked:

my stool contains black large flakes, say 1/4 inch in size. 1 1/2 days previous history of colon canc 15 yrs ago. anything to be concerned?

2 doctor answers4 doctors weighed in
Dr. Masoud Sadighpour
Internal Medicine 38 years experience
Black stool: Black stool or tarry black stool is a sign of upper GI tract bleeding, not from colon, but anyway needs to be evaluated.
Dr. Kenneth Smith
Internal Medicine 32 years experience
Stools: Unusual if a foodstuff cannot be blamed then GI eval in order. Unusual presentation but digested blood black. Given history concerned for later.

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Last updated May 12, 2019

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