There are the following sensations and symptoms of altitude sickness: 1. The most significant symptom is the sensation of circulatory system, there will be typical chest tightness, shortness of breath, palpitations, discomfort in the precordial area and weakness, etc. After exercise, it is obvious that there will be chest tightness, shortness of breath, palpitations and a feeling of pressure and discomfort in the precordial area of the heart, which is especially significant because of the strong lack of blood supply to the aorta and coronary arteries in the plateau. 2. There will also be significant cerebrovascular ischemic symptoms, such as dizziness, headache, head spontaneous distension and other clinical symptoms, which are caused by lack of oxygen to the brain. 3, there will be obvious respiratory insufficiency and other pulmonary insufficiency, in the plateau reaction arterial blood oxygen saturation significantly decreased, carbon dioxide partial pressure is too high, oxygen partial pressure is too low, so there will be lung function, such as shortness of breath, breathing is not smooth, respiratory failure The symptoms of altitude sickness are: inability to breathe normally and lie down normally, only sitting and breathing, and even coughing up phlegm and pink foamy phlegm.