An Italian study showed that hyperbaric oxygen combined with hormone therapy for sudden deafness was more effective than hormone or hyperbaric oxygen therapy alone. The principle of hyperbaric oxygen therapy for sudden deafness: Hyperbaric oxygen therapy can rapidly increase the partial pressure of arterial blood oxygen, blood oxygen content and capillary blood oxygen diffusion distance in human body, which can increase the partial pressure of oxygen in the inner and outer lymphatic fluid of the inner ear so that the hair cells inside and outside the spiral apparatus and the hair cells in the ridge of the pot belly and the sacral spot can obtain sufficient oxygen, improve their hypoxic state, enhance aerobic metabolism and weaken anaerobic metabolism, increase energy production and accelerate the repair of The repair of hair cells as well as cochlear and vestibular nerve fibers is accelerated. Increases the blood supply to the inner ear. It can improve the permeability of the inner ear hair cell endothelium and reduce exudation, and can improve edema in the inner ear caused by hypoxia. It can reduce the blood viscosity and improve the blood circulation in the inner ear. It can enhance the ability of phagocytes to engulf and kill and digest pathogenic microorganisms and necrotic cells. It should be noted that: 1. Age is an important determinant for the effectiveness of hyperbaric oxygen therapy, with younger patients having better treatment results than older patients; 2. Early treatment is more effective than late treatment; (2 weeks-3 months are considered to be in the early stage).