Lung Disease; Bronchitis

Bronchitis is one of common lung disease and one of most common lung disease that occur in upper respiratory tract infection. There are two kind of bronchitis, acute and chronic, each of which has unique etiologies, pathologies, and therapies.

1. Acute bronchitis
   It is characterized by the development of a cough, with or without the production of sputum, mucus that is expectorated (coughed up) from the respiratory tract. Acute bronchitis often occurs during the course of an acute viral illness such as the common cold or influenza. Viruses cause about 90% of cases of acute bronchitis while bacteria account for less than 10%.
   
2. Chronic bronchitis
   It is a type of chronic obstructive pulmonary disease, is characterized by the presence of a productive cough that lasts for 3 months or more per year for at least 2 years. Chronic bronchitis most often develops due to recurrent injury to the airways caused by inhaled irritants. Cigarette smoking is the most common cause, followed by air pollution and occupational exposure to irritants, and cold air.

Main Article: Disease in the Lungs