Black mucus or phlegm is usually a sign of an underlying condition, smoking, or exposure to pollutants. It may clear up on its own, but it sometimes requires treatment. Here, find out what causes black mucus and how to treat it.
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Black mucus or phlegm is usually a sign of an underlying condition, smoking, or exposure to pollutants. It may clear up on its own, but it sometimes requires treatment. Here, find out what causes black mucus and how to treat it.