Black coloured phlegm has to be smoke inhaled & now expelled out with phlegm.
Guess you are in a city with lot of exposure to vehicular emissions. Or you may be a smoker, active or passive.
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Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
Ear, Nose, Throat
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