A 44-year-old member asked:

What is grey mucus? what causes grey mucus?

1 doctor answer1 doctor weighed in
Dr. Sandra Eleczko
A Verified Doctoranswered
Dentistry 38 years experience
Pollution: Usually grey mucous means that you have been in a polluted or smoky area and your body is trying to get rid of this material and prevent it from getting into your lungs. If you live in a polluted city it may be hard to avoid inhaling the polluted air. If you are coughing alot, felling sick, or wheezing then you should see a doctor.
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Last updated Aug 13, 2018


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