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A 61-year-old male asked:

Hi doctors. my stool appeared blackish, but when i wiped it was yellow. i had a colonoscopy last october 2020 which showed diverticulosis but no colon cancer. could colon cancer develop in that time?

1 doctor answer • 1 doctor weighed in
Dr. Philip Schwarzman
Dr. Philip Schwarzmananswered
Emergency Medicine 46 years experience
Black stools are seen with upper GI bleeding (coming from the stomach) but would not clear so quickly. Certain foods and medicines can cause black stools (eg. iron, Pepto-Bismol). Colon cancer would not develop in 1 year.
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Answered Nov 07, 2021
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Very good evening doctors. When black stool is an indication of colon cancer or melena, is the stool also black when it is being wiped? If the stool is yellow or brown, could that also be a sign of colon cancer?
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Last updated May 10, 2022

Found in:

Adult health›Colon cancer›Colonoscopy

People also asked

Good morning doctors. I had a colonoscopy at the end of last October, 2020..no colon cancer only diverticulosis. Lately my stool is dark brown to almost black, but not quite black. What may this be?
1 doctor answer • 1 doctor weighed in
Had colonoscopy 6 months ago was diagnosed with diverticulosis otherwise no cancer or polyps the last 2 days I have had red to maroon color and small particles of food in stools could I have colon cancer or anal cancer after only 6 months of test?
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I did a CT scan came back negative for diverticulitis but showed a narrowing of the colon. 3cm. Other organs are ok. Does it mean I have colon cancer? I have no blood in stool but I had two episode of complete blockage with vomiting. Colonoscopy next
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Can colonoscopy(done by an incompetent doctor) cause colon cancer? Suppose the doctor nicks something you know? There's bright red blood in my stool.
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Possibility of having colon cancer two years after having colonoscopy that revealed two polyps 1 hyper, 1 tubular and diverticulosis.
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