What is Bronchitis?
Bronchitis is an inflammation of the bronchi, the large airways inside the lungs. (Bronchiolitis is the inflammation of the bronchioles, the small airways.) This inflammation often leads to increased mucus production in the airways. Bronchitis is generally caused either by a virus or by exposure to irritants such as dust, fumes, or cigarette smoke. If caused by a virus, the bronchitis will likely be only temporary. In the case of prolonged exposure to irritants, particularly cigarette smoking, if there is permanent damage to the bronchi, bronchitis may become chronic.
