What Are the Causes and Symptoms of Chronic Bronchitis? A Comprehensive Guide
Chronic bronchitis is a long-term inflammation of the bronchial airways defined by a persistent mucus-producing cough lasting at least 3 months per year for 2 or more consecutive years. The primary cause is cigarette smoking, which accounts for up to 75% of all cases. Other causes include prolonged exposure to air pollution, secondhand smoke, chemical