“Bronchitis occurs when an infection causes inflammation in the large airways. These include the trachea and bronchi, which are in the lower part of the respiratory tract.”

“Bronchitis occurs when an infection causes inflammation in the small airways. These include the trachea and bronchi, which are in the upper part of the respiratory tract.”

“Bronchitis occurs when an infection causes inflammation in the large airways. These include the trachea and bronchi, which are in the upper part of the respiratory tract.”

“Bronchitis occurs when an infection causes inflammation in the small airways. These include the trachea and bronchi, which are in the lower part of the respiratory tract.”