Acute bronchitis is a clinical syndrome characterized by transient inflammation of the large airways, including the trachea and bronchi. It is primarily defined by the development of a cough, with or without sputum production, typically lasting between one and three weeks.
The condition is most frequently caused by respiratory viruses, such as rhinovirus, enterovirus, influenza A and B, parainfluenza, and respiratory syncytial virus. These viral pathogens account for approximately 90% of cases. Bacterial infections, including Mycoplasma pneumoniae, Chlamydophila pneumoniae, and Bordetella pertussis, are responsible for a smaller percentage of instances. Environmental irritants, such as tobacco smoke, air pollution, and chemical fumes, can also trigger airway inflammation.
Symptoms of acute bronchitis commonly include a persistent cough, chest congestion, wheezing, and mild shortness of breath. Some individuals may experience systemic symptoms such as a low-grade fever, sore throat, or fatigue. Because these symptoms overlap with other respiratory illnesses, diagnosis is typically clinical, based on the patient's history and a physical examination. Diagnostic imaging, such as a chest X-ray, is generally reserved for cases where pneumonia is suspected or when symptoms are unusually severe or prolonged.
Management focuses on supportive care and the alleviation of symptoms, as the condition is usually self-limiting. Recommended interventions often include rest, adequate hydration, and the use of over-the-counter analgesics or antipyretics. Medical guidelines generally advise against the routine prescription of antibiotics for acute bronchitis, as they are ineffective against viral infections and do not significantly alter the course of the illness in otherwise healthy individuals.
