Bronchitis is primarily divided into two main types: acute and chronic.

Acute Bronchitis: This is a short-term condition typically caused by factors such as viral infections or allergic reactions. In acute bronchitis, the inner lining of the bronchial tubes becomes inflamed, swells, and produces excessive mucus. Viruses are the most common cause; however, bacterial infections can also lead to this condition, especially in enclosed and crowded environments.

Chronic Bronchitis: This is a more long-lasting and recurrent condition, predominantly linked to long-term cigarette smoking. Nevertheless, prolonged exposure to chemical irritants or occupational agents can also play a role in the development of chronic bronchitis.