Bronchitis Bronchitis Definition Bronchitis is an inflammation of the air passages between the throat and the lungs. This often includes the trachea and the bronchioles.
Acute bronchitis is usually a short-lived illness caused by a viral infection.
It may also be caused by bacteria or irritants in the air, such as allergens or air pollution. Chronic bronchitis is a condition associated with excessive mucus production sufficient to cause coughing for at least three consecutive months to a year. The most common causes of chronic bronchitis are cigarette smoking and occupational exposure. Viral bronchitis usually follows a cold or flu-like illness. Sputum coughed up is usually clear or white and fever is moderate if present.