Dry crusts or pus crusts may adhere to the posterior wall of the pharynx, usually with a foul odor is the clinical manifestation of atrophic and dry pharyngitis, which is often referred to as a type of chronic pharyngitis, and is less common in clinical practice. In the early stages of the disease, mucus gland secretion is reduced and the secretions are thick and dry. Following the chronic inflammation of the submucosa, mechanization and contraction gradually occur, compressing the glands and blood vessels, reducing glandular secretion and nutritional disorders, resulting in gradual atrophy and thinning of the mucosa and submucosa. So what is the cause of his pathogenesis? Let’s take a look together. The reason 1, external factors: If you live in a cold, dry climate, work environment air is dust, chemical gas pollution, or throat long-term stimulation by tobacco, alcohol, spicy food, it is easy to get pharyngitis. 2, physical factors: pharyngitis can also be a local manifestation of certain systemic diseases, such as anemia, indigestion, long-term constipation, heart disease, bronchitis, asthma, liver lesions, diabetes and chronic nephritis, etc. 3, occupational factors: mainly occurs in voice workers, such as: teachers, actors and so on. Because of long-term multi-lingual and singing, can stimulate the pharynx, causing chronic congestion and disease. 4.Viral infection: mainly coxsackievirus, adenovirus, parainfluenza virus. 5, bacterial infection: streptococcus, staphylococcus and streptococcus pneumoniae are common, including group A type B streptococcus infection is the most serious, can lead to septic lesions in distant organs, called acute septic pharyngitis. Chronic pharyngitis is a diffuse inflammation of the pharyngeal mucosa, submucosa and lymphoid tissue, often as part of a chronic inflammation of the respiratory tract, with a long course and stubborn symptoms that are difficult to cure. Patients with chronic pharyngitis often feel dry, itchy, swollen, foreign body sensation, morning cough, secretion is small and sticky, not easy to cough up; usually emit “utter”, “cackle” sound. Chronic pharyngitis symptoms are often aggravated by excessive speech or weather changes, overexertion, and excessive consumption of irritating foods.