A member asked:

Causes of yellow sputum in morning sometime little black particles in it?

A doctor has provided 1 answer

Many possibilities: Post-nasal drip, gastrointestinal reflux, smoking creating brochitis, occupational exposure to pollutants, or living in an area where environmental pollutants are high. If you don't smoke, suggest you see a primary care doctor who may refer you, if necessary, to a pulmonary specialist.

Answered 4/23/2019

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