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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A doctor has provided 1 answer
A doctor has provided 1 answer
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