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A cough can be fleeting or chronic. But often it’s the first sign that your lungs are ailing—whether from a common cold, allergies, or something more serious like pneumonia or COVID-19.

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Chest Pain and Cough

A cough and chest pain may be caused by pleurisy—when the tissue lining your lungs and chest is irritated. But pneumonia, asthma, bronchitis, and other more serious conditions may cause chest pain and cough.
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What Causes Brown, Black, or Colored Mucus With Your Cough

Coughing up black or brown mucus can occur when from environmental conditions like pollution or smoking. Other causes of brown phlegm include small amounts of blood located in the throat or further down in the airway.
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