Bronchitis - Symptoms and causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/bronchitis/symptoms-causes/syc-20355566
WEBApr 11, 2017 · Bronchitis is an inflammation of the lining of your bronchial tubes, which carry air to and from your lungs. People who have bronchitis often cough up thickened mucus, which can be discolored. Bronchitis may be either acute or chronic. Often developing from a cold or other respiratory infection, acute bronchitis is very common.
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