Chronic bronchitis is most frequently caused by long term irritation of the bronchial tubes. Bronchitis is considered "chronic" if symptoms continue for three months or longer. Bronchitis caused by allergies can also be classified as chronic bronchitis. Chronic bronchitis is caused most often by exposure to airborne pollutants such as cigarette smoke, excessive dust in the air, or chemicals. The bronchial lining becomes inflamed and the constant exposure to such pollutants begins to cause damage in the bronchioles (the smaller airways in the lungs). Symptoms of chronic bronchitis include shortness of breath or wheezing, chest pain, and chronic productive cough.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.