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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