Acute plateau reaction, or acute mild plateau disease, refers to a series of acute hypoxic stress reactions that occur when people in the plains enter the plateau because the adaptation mechanism to the environment has not yet been established. The symptoms of hypoxia may appear after 1 to 3 days or even a few hours after first entering the plateau, and most people can tolerate it, and it can be gradually relieved in 5 to 10 days. Low oxygen and low air pressure are the root causes of the disease, but many triggering factors cannot be ignored, including cold, cold, lack of sleep, motion sickness, mental stress and fatigue. Those who enter the plateau rapidly have a high incidence and heavy symptoms, while those who enter the plateau slowly have a lighter reaction. In addition, the onset of the disease is also related to the season of entry, often light in summer and heavy in winter. People with chronic diseases or obesity are more likely to have acute plateau reactions, and the symptoms are heavier and last longer. Clinical manifestations: nervous system: headache, dizziness, excitement, insomnia and dreaminess, etc. If the headache is severe, and there is severe nausea and vomiting, indifferent expression, unresponsiveness, drowsiness, gait instability and other mental and neurological abnormal behavior, may have appeared plateau cerebral edema. Respiratory system: deep and rapid breathing, exertional dyspnea, etc. Respiratory alkalosis manifestations such as hand and foot numbness and even convulsions occur after hyperventilation. Circulatory system: cyanosis, rapid heartbeat, etc., heart rate can reach 120 times / min, self-conscious panic, chest tightness. Digestive system: common symptoms are lack of appetite, abdominal distension, diarrhea, etc.