" Bronchitis is a respiratory disease which causes inflammation of the bronchial passages inside the lungs. When these passages become inflated, the airways become restricted and shut off which can cause coughing and breathlessness. Bronchitis can be classified as acute or chronic. Acute bronchitis can last about a week. Chronic bronchitis can last months and return frequently. Acute bronchitis is often caused by a virus but can occasionally be bacterial. Chronic bronchitis is often severe and ...