Postviral bronchitis: Prolonged cough after a cold is very common. Usually it isn't serious and gradually improves, although it can take a few weeks. See a doctor if it's severe and bothersome, if you have a history of asthma or other chronic lung problem, or if you also develop fever again start to cough up sputum (phlegm). If you are a smoker, try to stop.
Answered 7/30/2019
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