Chronic bronchitis is a long-term inflammation of the airways in the lungs, leading to persistent cough and mucus production. It is often caused by prolonged exposure to irritants, such as cigarette smoke, air pollution, or dust. This condition is part of a group of diseases known as chronic obstructive pulmonary disease (COPD). People with chronic bronchitis may experience difficulty breathing, wheezing, and frequent respiratory infections. Diagnosis typically involves a physical examination, medical history, and lung function tests. Treatment focuses on relieving symptoms and may include medications, lifestyle changes, and avoiding irritants.