Chronic pharyngitis secretes mucus because of hypertrophy and hypersecretion of mucous glands.
Chronic pharyngitis is a diffuse chronic inflammation of the pharyngeal mucosa, submucosa and lymphoid tissues, often as part of chronic inflammation of the upper respiratory tract. Clinical manifestations are foreign body sensation, itching, burning, dryness or slight pain in the pharynx. The patient often has mucous secretions adhering to the posterior wall of the pharynx, and frequent irritating cough with nausea occurs in the morning. There is no sputum or only granular root powder-like secretions are coughed up.
Chronic pharyngitis often secretes mucus because the pharyngeal mucosa is congested, resulting in submucosal connective tissue and lymphoid tissue hyperplasia, squamous epithelial layer thickening, the subepithelial layer of small blood vessels increased, so that there are lymphocytes around the infiltration of mucous glands hypertrophy, hypersecretion, so mucus increased.