Bronchitis is an inflammation of the bronchi of the lungs, that causes the cilia of the bronchial epithelial cells to stop functioning.

Like many disorders, it can be acute, or take a long period of time (chronic). Chronic bronchitis is a problem commonly seen in smokerss, whereas acute bronchitis is usually a secondary bacterial infection following a primary viral infection.

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Acute bronchitis

Chronic bronchitis

Chronic bronchitis is a chronic obstructive respiratory disease, where the airways are obstructed by plugs of mucus.