Bronchitis
Bronchitis is an inflammation or swelling of the bronchial tubes (bronchi), the air passages between the mouth and nose and the lungs.
More specifically, bronchitis describes a condition where the lining of the bronchial tubes becomes inflamed.
Individuals with bronchitis have a reduced ability to breathe air and oxygen into their lungs; also, they cannot clear heavy mucus or phlegm from their airways.