Bronchitis is the inflammation of the bronchi, the main air passages to the lungs. It often results from a respiratory infection caused by a virus or bacteria. Symptoms include coughing, shortness of breath, wheezing, and fatigue.
Review Date 11/27/2020
Updated by: Denis Hadjiliadis, MD, MHS, Paul F. Harron, Jr. Associate Professor of Medicine, Pulmonary, Allergy, and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.