Inflammation of Bronchi Bronchitis refers to the inflammation of the mucous membrane lining the bronchial tubes within the lungs. Bronchitis may be acute or chronic. In chronic cases, the disease is of long duration and more serious. Causes and Symptoms of Bronchitis Due to inflammation in the bronchi, large quantities of mucus are secreted and expelled as phlegm. This phlegm is sticky, semifluid and [...]