Inflammation in the lining of the bronchial tubes can cause bronchitis. The bronchial tubes are the airways that make the connection between the trachea, which is also known as the windpipe, and the lungs. The lining of the bronchial tubes acts as a protection and a covering for the respiratory system.
Bronchitis comes with a cough. The associated excessive mucus production, wheezing, shortness of breath, and tightness constricting the chest can make life miserable. Increased mucus production that begins to form in the lining of the bronchial tubes is the body’s attempt to reduce the irritation and inflammation that has been building in the bronchial tubes.
Bronchitis can occur in either an acute or a chronic form.
Viral infections attacking the respiratory tract and the bronchial tubes are the usual sources of acute bronchitis. These viruses can be easily passed on via the air when someone coughs near you.
https://www.empowher.com/bronchitis/content/bronchitis-inflammation-and-irritation-bronchial-tubes