Hyperbaric oxygen is often used in intracranial diseases, such as traumatic brain injury, impaired consciousness, ischemia, hypoxia, gas poisoning and other cases of better results, but do hyperbaric oxygen must grasp the indications and contraindications, some diseases are not suitable, the human body has certain disadvantages, including: 1, will cause decompression sickness; 2, otitis media, sinusitis, cold patients, the situation of non-passage of more serious complications, can not do hyperbaric oxygen ; 3, high intraocular pressure, retinal detachment of the lesion patients, can not do hyperbaric oxygen; 4, the lungs have pneumothorax or pulmonary blister, can not do hyperbaric oxygen; 5, chronic emphysema itself hypoxia is as an effective means of stimulating the respiratory center, hypoxia completely corrected after doing hyperbaric oxygen may appear respiratory failure. Therefore, hyperbaric oxygen has certain contraindications, and patients must be under the guidance of a doctor.