Nitrogen poisoning is mainly manifested as a series of symptoms of lack of oxygen in the body. If nitrogen poisoning occurs, you must immediately get out of the scene environment, then go to a ventilated and breathable environment, give oxygen immediately if possible, and then send to the hospital for emergency treatment. But after leaving the scene environment, the patient’s breathing and heartbeat must be judged first. If there is respiratory and cardiac arrest, you should give CPR at the scene while calling 120 to request medical personnel to come to your aid. If respiration and heartbeat are present, after being sent to the hospital, usually as much as possible in the case of stabilization of vital signs, apply for hyperbaric oxygen therapy, which can quickly correct the lack of oxygen in the body. If the hypoxia is longer, it may lead to hypoxia in the brain and cerebral edema, mannitol and tachypnea can be applied to reduce cerebral edema. Next is symptomatic treatment, close observation of the condition, if there is shock, low blood pressure, etc., should be immediately given to expand blood volume, maintain blood pressure with antihypertensive drugs, anti-shock treatment.