I am getting black cough from lungs from last 1 month, I was a smoker for almost 4 months and left smoking 3 weeks ago. Please suggest next step , is it sign of any serioys disease.I don't have any other symptom other than black mucus and some times frequent throat clearing .
I i have a mild back pain just back side of heart.When i take a deep breath (inhale)i feel a mild block i
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