Altitude reaction refers to a series of symptoms that occur in human body after entering a certain altitude due to low pressure and low oxygen, such as dizziness, headache, nausea, vomiting, chest tightness, palpitations and so on. The altitude reaction usually occurs when the human body enters the area above 2700m above sea level, but whether and when it occurs is a more random thing. The causes are also more extensive, such as overexcitement, cold at night, sleeplessness and lack of sleep. In addition, even if a person often stays in the plateau, going down the mountain and then going up again is not a guarantee that altitude sickness will not occur. Therefore, before going to a high altitude area, make sure to prepare accordingly, such as taking anti-hypoxia drugs in advance. Plateau reaction can be divided into two kinds of acute plateau reaction and chronic plateau reaction. In general, the reaction when entering the plateau is acute plateau reaction, after a period of rest, the acute plateau reaction will gradually disappear. However, if some patients with serious symptoms are not treated in time, they may develop into chronic plateau reaction, and some of them may even develop into plateau pulmonary edema or plateau cerebral edema. 1.Acute plateau reaction: It mostly occurs within a few hours after the patient enters the high altitude area from the low altitude area, and its symptoms mainly include dizziness, headache, nausea, vomiting, rapid heartbeat, chest tightness, shortness of breath, cyanosis of lips, end of nails, weakness of the body, and the body’s body. Cyanosis, weakness, loss of appetite, sleep disorder, low urine, peripheral edema, etc.; 2. Chronic plateau reaction: if the patient suffers from acute plateau reaction and does not recover for more than 3 months, it can develop into chronic plateau reaction. The main symptoms are headache, dizziness, insomnia, memory loss, inattention, etc. Sometimes cardiac arrhythmia or transient syncope can also occur; 3. Plateau pulmonary edema: the condition is critical, mostly after 2-3 days of entering the plateau. Patients mainly show breathing difficulties, may have wheezing, coughing, coughing white or pink foamy sputum, the lungs can appear obvious wet rales; 4, plateau cerebral edema: mostly in 1-3 days after entering the plateau onset, patients will appear severe headache, vomiting, the spirit can show depression, can also appear euphoric multilingual. Most patients show irritability, staggering gait, ataxia, and may appear to be in a trance, blurred consciousness, drowsiness, or even coma and other disorders of consciousness. If a patient experiences any of these reactions, immediate rest and oxygen therapy is required. If the symptoms are not relieved, or continue to worsen, they need to turn back immediately to avoid endangering their lives due to untimely treatment.