Bronchitis is an inflammation of the bronchial tubes, the airways that carry air to your lungs. It causes a cough that often brings up mucus, as well as shortness of breath, wheezing, and chest tightness. There are two main types of bronchitis: acute and chronic. The same viruses that cause colds and the flu often cause acute bronchitis.
Click here for more information http://www.nlm.nih.gov/medlineplus/acutebronchitis.html