Hyperbaric oxygen can assist in the treatment of tinnitus to a certain extent. The principle of hyperbaric oxygen therapy in treating tinnitus mainly has the following points: increase physical dissolved oxygen, improve lymphatic circulation, etc. 1. Increase physical dissolved oxygen: Hyperbaric oxygen can increase the physical dissolved oxygen in the blood and tissues, increase the penetration of oxygen, increase the oxygen reserve in the tissues, and improve the body’s tolerance to hypoxia. 2. Improvement of lymphatic circulation: Hyperbaric oxygen therapy can improve the lymphatic circulation in and out of the ear, mainly through the absorption of pure oxygen to promote the elevation of the partial pressure of oxygen in the blood, thus alleviating the hypoxic state of the auditory nerve and promoting nerve repair. At present, the treatment of tinnitus is mainly based on comprehensive treatment, among which, hyperbaric oxygen therapy combined with other treatment methods has been proven to be effective. Studies have shown that hyperbaric oxygen therapy can effectively improve the severity of tinnitus.