Chronic simple pharyngitis, also known as chronic pharyngitis, is more common. The lesions are mainly in mucous membrane, showing chronic congestion of pharyngeal mucosa, and there are many lymphocytes infiltration around its blood vessels, as well as white blood cells and plasma cells infiltration. Mucosal and submucosal connective tissue hyperplasia. Mucous glands can be hypertrophy, excessive secretion and increased mucus secretion. It is more common in adults, with a long course of disease and easy recurrence.