Bronchitis is a lower respiratory tract problem that is manifested by an inflammation and/or infection of airways which includes the trachea and larger air tubes that carry oxygen into the lungs. There are two kinds of bronchitis: acute (small-term) bronchitis and chronic (long-term) bronchitis.

Acute bronchitis is usually followed by a viral infection, primarily upsetting the nasal cavity, sinuses, and the throat and then extending to the larger bronchial airway passages. Other times, the patient may buy a bacterial infection. This goes to show that the inflamed respiratory tract will be infested by bacteria.