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I'm a nonsmoker & 22 years old. From last December I am observing some black hairy things when I cough up.... I was given a Chest X-ray which came out clear the doc said the black things could be dirt and I also had back pain back xray showed it was muscle spasm.... But I still observe those black things in my mucus... I want add I'm quite healthy and didnt loose any weight recently... What may be the reason... Should I conduct my GP again???
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