3 doctors weighed in:

Will stool turn dark brown when drink black coffee?

3 doctors weighed in
Dr. Charles Cattano
Internal Medicine - Gastroenterology
2 doctors agree

In brief: Too much coffee?

Dark-colored stools may result from iron supplements, foods you eat (like a lot of spinach), substances (like peptobismol), but most significantly suggests bleeding.
When blood is denatured by acid in your stomach, as from ulcers, stools will turn tarry ("melena"). Blood may also be ingested from nose bleeds, bleeding gums... Persistent melena (without obvious cause) ; symptoms warrants md visit.

In brief: Too much coffee?

Dark-colored stools may result from iron supplements, foods you eat (like a lot of spinach), substances (like peptobismol), but most significantly suggests bleeding.
When blood is denatured by acid in your stomach, as from ulcers, stools will turn tarry ("melena"). Blood may also be ingested from nose bleeds, bleeding gums... Persistent melena (without obvious cause) ; symptoms warrants md visit.
Dr. Charles Cattano
Dr. Charles Cattano
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