A member asked:

What possible causes of a cough that brings up a black substance are there?

A doctor has provided 1 answer
Dr. Michael Zacharisen answered

Specializes in Allergy and Immunology

Productive cough: Some potential explanations for a cough that produces "black" material or mucus includes: dried blood, fungus/mold infection or colonization, particles from smoke or grinding/sanding that a person is exposed to and inhales during their occupation or hobby.

Answered 9/28/2016

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