Under normal circumstances, patients will have clinical symptoms and reactions of chest tightness during low air pressure, and there are physiological reasons and pathological factors. For physiological reasons, because the air is thinner, oxygen content is relatively low, and oxygen concentration is relatively low, patients will have different degrees of clinical symptoms of chest tightness and shortness of breath due to the decrease of blood oxygen saturation and insufficient partial pressure of oxygen in the body, which is normal if patients feel significantly relieved and improved by improving air pressure. However, if the patient has symptoms of chest tightness for a long time, the compensatory function of the heart is insufficient, or the patient has chronic heart failure or chronic lung failure, there will be obvious chest tightness and shortness of breath when the blood pressure is low and the air pressure is low, which is directly related to the supply of oxygen and blood supply to the cardiac muscle cells, if the chest tightness is not relieved for a long time, you must actively go to the hospital for treatment.