Bronchitis is defined as the inflammation of the bronchial tubes, which are major airways in the lungs. This inflammation causes the airways to swell and narrow, often leading to symptoms such as coughing, wheezing, and mucus production. The condition exists in varying forms, including acute bronchitis, which typically follows a respiratory infection, and chronic bronchitis, which involves long-term inflammation associated with persistent cough and mucus buildup. The biological processes involved primarily relate to the irritation of the respiratory mucosa and subsequent inflammatory response, making it a common condition within pulmonary health sciences. Management involves treating the underlying inflammation and promoting clear airways to facilitate proper gas exchange.