Bronchitis is an inflammation of the airways. Chronic bronchitis is a serious condition when the bronchial tubes, which carry air to and from your lungs, become inflamed over a long period of time. This can cause a chronic cough.
If you have bronchitis, you might wheeze or have chest discomfort. Your breathing might become very quick, because the bronchial tubes cannot funnel enough air.
Smoking is a major cause of chronic bronchitis. Overexposure to lung irritants, including tobacco smoke, air pollution, dust, fumes and vapors from a specific work environment can also cause or worsen symptoms.