A member asked:

What is the cause of black slimy stool?

A doctor has provided 1 answer
Dr. Heidi Fowler answered

Specializes in Psychiatry

Get eval: Some causes of stool being black include taking medications that contain bismuth or eating foods or supplements that contain iron. Stool that is black, tarry and smells bad can be melena. Melena is due to GI bleeding. Recommend prompt medical evaluation.

Answered 10/17/2016

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