What are the causes of bronchitis in children?

The main causes of bronchitis in children include the following aspects: 1. Infection factors: This is the most common cause of bronchitis in children, primarily triggered by upper respiratory tract infections. When pathogens invade the upper respiratory tract, they infect the mucous membranes, which can lead to tracheal inflammation. In addition, infections with various viruses and bacteria, such as respiratory syncytial virus, adenovirus, rhinovirus, and Mycoplasma pneumoniae, may also cause bronchitis. 2. Environmental factors: Living long-term in an environment with significant air pollution or exposure to smoke, dust, and other harmful substances increases the risk of developing bronchitis. 3. Physical factors: Infants and young children generally have weaker constitutions; their trachea and bronchi are narrower, and their mucous membranes are more susceptible to infection or swelling and congestion from other irritants, which can lead to bronchitis. Parents should pay attention to their children's health status and take timely preventive measures to reduce the risk of illness.