Laryngitis that does not heal for a long time may be caused by the persistence of etiology or triggers for standardized treatment and so on. Reflux pharyngitis, chronic simple pharyngitis, atrophic pharyngitis and other causes. 1. Reflux pharyngitis: a variety of reasons lead to reflux of gastric contents, irritation of the throat, causing inflammation, hoarseness, foreign body sensation in the throat, burning sensation and other symptoms. If the reflux persists, the laryngitis will not be cured for a long time. The use of drugs to inhibit gastric acid and promote gastric power should be prescribed by the doctor. 2. Chronic simple pharyngitis: it may be caused by the stimulation of adverse physical and chemical factors, pathogenic bacteria infection, etc. The mucous membrane of the throat undergoes inflammatory reaction, which is manifested as itching in the throat, irritating dry cough, and foreign body sensation in the throat. Adverse factors persist, and the symptoms will appear for a long time. It is necessary to follow the doctor’s instructions for symptomatic treatment. 3. Atrophic pharyngitis: the disease is mainly manifested as pharyngeal glands and mucosal atrophy, resulting in decreased secretion of mucous glands, secretion viscous, is caused by inflammation of the submucosal layer, the occurrence of mechanization and contraction of oppression of mucous glands, vascular gland secretion, as well as for the supply of nutrient supply, resulting in the condition of prolonged non-healing. For treatment, small doses of iodine (2% iodized glycerin) can be applied to the mucous membrane of the posterior wall, which can promote glandular secretion and improve the symptoms of dryness. Nebulization can also reduce dryness. Taking vitamin A, vitamin B₂, vitamin C and vitamin E can promote the growth of mucosal epithelium. Patients with laryngitis are advised to actively seek medical treatment and systematic examination to clarify the diagnosis and etiology.