1. Ear pressure injury: the most common complication of hyperbaric oxygen therapy. The middle ear is a cavity called the tympanic cavity, the outer side of which is separated from the external ear canal by the tympanic membrane, and the other end of which opens through the eustachian tube at the back of the inferior nasal isthmus. If the external pressure increases during hyperbaric oxygen therapy, and if the eustachian tube is not open for various reasons (upper sensation, rhinitis, nasopharyngeal polyps, poor coordination of pressure regulation, etc.), the external gas cannot enter the tympanic cavity through the eustachian tube, causing the pressure inside the tympanic cavity to be lower than the external pressure, the mucous membrane inside the cavity becomes congested, edematous and exudates, resulting in otorrhoid pressure injury. The patient will feel the pain in the ear, which will continue to worsen as the pressure rises. Prevention: Patients with upper respiratory tract infection, rhinitis and sinusitis should not enter the chamber. In the process of pressure boosting and decompression in the cabin, pay attention to do swallowing action. 2, sinus air pressure injury: any blockage of the sinus opening, such as tissue hyperplasia, edema, mucus, etc., can cause sinus air pressure injury. The main manifestation is headache, maxillary sinus pneumatic injury pain in the cheek; frontal sinus pain in the forehead; septal sinus pain in the root of the nose; pterygoid sinus pain in the occipital region and behind the eyes. Examination may reveal a nasal discharge or a bloody discharge. The prevention method is similar to that of ear pressure injury. 3.Finger numbness: some patients treated with hyperbaric oxygen will have ulnar side finger numbness, the mechanism is unclear, and the sensation disappears after 4-6 weeks of stopping treatment, mostly without permanent residual symptoms. 4, pulmonary air pressure injury: very rare, pulmonary air pressure injury is seen in diving, caisson workers, patients undergoing hyperbaric or hyperbaric oxygen therapy during the decompression process inappropriate breath-holding, coughing, vomiting, convulsions (epileptic seizures, cerebral oxygen toxicity) to close the vocal cords, resulting in the trachea and lung pressure is greater than the external pressure. Due to the poor pressure-bearing capacity of the lung tissue, when the pressure difference between the inside and outside of the lung is greater than 80 mmHg, the lung tissue will over-expand, resulting in the tearing of the alveolar wall, blood vessels, and interstitium and the occurrence of pneumothorax, mediastinal emphysema, and subcutaneous emphysema, which is manifested by sudden chest tingling and increased breathing, persistent cough, breath-holding, cyanosis, shortness of breath, and in severe cases, life-threatening. Therefore, patients with chronic lung diseases, such as pneumothorax and pneumothorax, should not enter the chamber. Patients receiving treatment in the hyperbaric chamber should not hold their breath for a long time during the decompression process.