Chronic bronchitis is most frequently caused by long term irritation of the bronchial tubes. Bronchitis is considered "chronic" if symptoms continue for three months or longer. Bronchitis caused by allergies can also be classified as chronic bronc...
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Update Date:
August 3, 2007
Allen J. Blaivas, DO, Pulmonary, Critical Care, and Sleep Medicine, Department of Veteran Affairs, VA New Jersey Health Care System, East Orange, NJ. Review provided by VeriMed Healthcare Network.