A member asked:

Am a 20 year old female,i don't drink nor smoke.i've observed for 5 days that the phlegm from my throat is black in colour only in the morning,?

A doctor has provided 1 answer

Check filters: This could be due to unclean filters in your home's HVAC system. Your nose/lungs function to filter dust/debris that you inhale. Try this, and see if this symptom disappears.

Answered 1/27/2017

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Thank

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