Bronchitis is inflammation of the airways, and it may cause symptoms of chest pain, coughing, trouble breathing, or sputum. It can be related to a bacterial infection, viral infection or no infection. Although viral infections are relatively contagious, most cases of bronchitis are not contagious.
Many people have chronic bronchitis symptoms, meaning they may have the symptoms over and over again. Normally chronic bronchitis is related to smoking or chronic obstructive pulmonary disease.