The hazards of hyperbaric chamber, on the whole, the hyperbaric chamber treatment is carried out in consideration of the condition required, and generally the benefits outweigh the disadvantages. For the hazards of hyperbaric chamber or its danger, mainly from the high-pressure environment, the specific hazards are as follows: 1, the impact on sensitive organs: because the human body itself lives within an atmospheric pressure, into the hyperbaric chamber may reach two or three atmospheric pressure. The impact on the patient’s ear, nose and other organs sensitive to pressure is relatively large, may cause tinnitus, deafness, and even pain in the pharyngeal tube. 2, rupture of pulmonary herpes: If there is pulmonary herpes, it may cause pulmonary herpes rupture, and then cause pulmonary hemorrhage, which is the main hazard, by doing the contraindication screening of hyperbaric oxygen, including lung CT, etc., if there is no problem, after entering the hyperbaric chamber, through the hyperbaric chamber 3, can not be timely rescue: some patients with underlying diseases, if a heart attack or other discomfort occurs in the cabin, the hyperbaric chamber can not immediately open the door, need a pressure relief process, may take half an hour. So patients who are at risk in this area may not be able to get timely treatment, and need comprehensive consideration.