Bronchitis can be divided into acute and chronic forms. In the
acute form, the trachea and bronchi, or the large airways of the
lungs, become inflamed. The infection generally spreads through
the bronchi. A deep cough occurs that usually brings up
yellowish sputum. In chronic bronchitis there is chronic
inflammation and thickening of the lining of the bronchial
tubes. As these airways narrow, there might be difficulty
breathing. There is often large amounts of mucus produced,
further impairing breathing. Most people with chronic
obstructive pulmonary disease have a combination of emphysema
and bronchitis. Causes of Bronchitis Acute bronchitis is most
commonly a viral infection. Exposure to airborne irritants can
lead to on infectious bronchitis as can a chronic cough.
Sometimes, a secondary bacterial infection can affect the mucus
membranes that line the bronchi. In this situation, it is often
necessary to receive antibiotic therapy. Smoking is the major
cause of chronic bronchitis. Air pollution, dusts and t