Sudden deafness is a sudden onset of sensorineural hearing loss, usually within minutes, hours or a day (usually about 12 hours), in which the patient loses hearing to a nadir, at least at connected frequencies of greater than 30 dB. The disease is often accompanied by tinnitus, ear congestion, and in severe cases, may be accompanied by vertigo and vomiting. It is more common in middle-aged people, and there is no significant difference in the incidence between men and women. The etiology of sudden deafness is unknown, but it is mainly related to infection, impaired blood supply to the inner ear, drug intoxication, and autoimmune reaction. A series of clinical tests are needed to find the possible causes. Treatment and recovery of sudden deafness 1. Clinical treatment mainly includes etiologic treatment and empirical treatment. 2. Etiologic treatment is the treatment of different causes of deafness that are identified. For example, anti-infective treatment is given to those with infectious etiology, and ototoxic drugs are stopped for those with drug toxicity. Empirical treatment mainly includes improving blood rheology, vasodilating and fibrinolytic drugs, glucocorticoids, neurotrophic drugs, etc., and can be supplemented with mixed oxygen or hyperbaric chamber treatment. Some patients may recover on their own without treatment of sudden deafness, but if treated with standard medication, will be able to improve the degree of hearing recovery, and may even return to the pre-onset level. After the recovery, it is still necessary to adjust the life and rest, avoid strain, and if there is a reoccurrence, promptly seek medical treatment. The hospital has a special hyperbaric oxygen facility and comprehensive hearing examination equipment, patients can be admitted to receive hyperbaric oxygen and infusion therapy to avoid aggravation of the disease, regular review of hearing during admission, to grasp the hearing changes, adjust the medication.