Bronchitis is an inflammation of the bronchi (lung airways), resulting in persistent cough that produces considerable quantities of sputum (phlegm). Bronchitis is more common in smokers and in areas with high atmospheric pollution.
Inflammation of the airways that causes increased mucus to be produced. Bronchitis is considered chronic (or long-term) if one coughs and produces excess mucus most days during three months in a year, for two years in a row.
A chronic inflammatory disease of the lungs commonly caused by cigarette smoking