The beautiful plateau makes people yearn for it, and many people have the idea of “the plateau is so beautiful, I want to see it”. Although the world’s wonders and wonders often lie in the danger and far, the world is so big, it is better to go to see it according to your ability, not to be reckless. Here for people who want to choose the highland area tourism knowledge, high altitude reaction is not to be underestimated, choose need to be careful ah. A. Plateau reaction Highland reaction (Acute mountain sickness), refers to the acute pathological reaction in high altitude areas because of the decrease in air pressure and oxygen concentration. The severity of symptoms mainly depends on the speed of arrival at high altitude and the degree of your effort, the symptoms can be mild or severe, and the severity can be life-threatening, and can involve the nervous system, respiratory system, muscles and cardiovascular system. It is common in mild patients, and symptoms include: difficulty sleeping;. dizziness; fatigue; headache; loss of appetite; nausea and vomiting;. rapid heartbeat; and difficulty breathing. Symptoms in severe patients include: skin cyanosis; chest urgency; confusion; cough, hemoptysis; decreased level of consciousness or social function; pallor; inability to walk in a straight line or even unable to walk; difficulty breathing at rest. People most prone to altitude sickness People who usually live at very low altitude; people who change altitude too fast in a short period of time; people with chronic heart and lung diseases; people who are in mountain climbing, hiking, skiing and traveling in high altitude (usually 2400 meters or higher) areas. The presence of pulmonary edema is indicated by the presence of wet rales on lung auscultation. The following tests should be performed as soon as possible to determine the condition:. Blood count: CT of the lungs and CT or MRI of the brain; electrocardiogram. IV. How to treat Early diagnosis and treatment are extremely important. The main treatment measures are safe and rapid transfer to a low altitude area and, if conditions permit, administration of oxygen. Acetazolamide can alleviate the symptoms in mild patients. The drug makes people urinate more, so make sure to drink enough water and avoid alcohol intake when taking the drug. This drug is more effective in reducing the symptoms of altitude sickness when taken before reaching high altitude. Acute pulmonary edema treatment measures: oxygen absorption; oral antihypertensive drug nifedipine; application of beta agonists to expand the airway; severe patients apply ventilator assisted breathing; application of phosphodiesterase inhibitors to increase pulmonary blood flow, such as sildenafil; in addition, the application of dexamethasone can reduce cerebral edema. V. What is the prognosis of altitude sickness? Most patients have mild symptoms, and the symptoms can be relieved quickly after lowering the altitude they are at, but a few severe patients will die due to pulmonary edema and cerebral edema. The most common complications are: coma, pulmonary edema, mental and psychological changes, and even permanent neurological damage; 6.