Mucus production is natural. However, overproduction of mucus in the throat can lead to long-term coughing and throat irritation. Certain conditions and factors can lead to an excess of mucus, such as ...
Phlegm is a form of respiratory mucus produced by the lungs. The airways between the larynx and the respiratory bronchioles are lined by columnar epithelium over which an airway surface liquid (ASL) ...