A member asked:

Coughing up yellow phlegm. how do i know if it's from my lungs or throat? i do have a post nasal drip but that stuff generally looks lighter in color.

A doctor has provided 1 answer
Dr. Al Hegab answered

Specializes in Allergy and Immunology

Your sinuses: most probably, as you would be much sicker if that phlegm is coming from your lungs, although it is still a possibility. upper respiratory tract infection is more common, and your description of post nasal drip supports a sinus problem, you may want to see your doctor, as you may need an antibiotic, in the interim saline nasal washes would help, good luck

Answered 5/25/2017

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