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A 35-year-old member asked:

Could impacted stool in large colon and rectum cause black stools?

1 doctor answer2 doctors weighed in
Dr. Barry Marged
A Verified Doctoranswered
A US doctor answeredLearn more
Not likely: From the standpoint of the medical profession, black stools -called melena - are always assumed to be blood. Usually representing bleeding from stomach or "higher up" within the intestines. Colon bleeding usually is red. Unfortunately, bismouth containing medications can also cause black stool, but even with that type of product, one cannot be sure there is not bleeding also. Needs evaluation.

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A 31-year-old member asked:

Can impacted stool in large colon and rectum cause black stools? What are your expert opinions?

1 doctor answer3 doctors weighed in
Dr. Glenn Messina
Aesthetic Medicine 35 years experience
No: Darker but not black. Black stool can be from blood entering and mixing in the stool high up in the GI tract notably stomach and duodenum. Black can also be from iron pills and high iron intake in consuming a lot of high iron meals like spinach and green leafys. East to rule out blood with a simple smear at the doctors office. that's my advice.

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Last updated Feb 21, 2019

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