It is caused by bacteria that lie dormant in your body for many years until awakened when your immune system becomes weakened. Tuberculosis: This serious lung infection is highly contagious and can be fatal if not properly treated.Infections may lead to coughing up brown or black mucus, such as the following. Fire: Inhaling smoke while around a fire can burn your airways and also deposit brown or black soot.Coal mining: Classically called "black lung," this condition occurs in coal miners who inhale dust during their work if they do not wear appropriate protective equipment. It often appears brown or black when coughed up.
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