Chronic bronchitis is an inflammation of the bronchial tubes characterized by mucus production and breathing difficulties, impacting approximately 3.49% of adults over 35 in India. It can be acute or chronic, with acute cases often following viral infections and chronic cases resulting from long-term irritants like smoking and air pollution. Management includes rest, hydration, medications such as antibiotics and bronchodilators, and addressing complications like pneumonia and COPD.