Mild hypoxic changes indicate a hypoxic state of the organism and are usually the main manifestation of diseases such as chronic pulmonary hypertension as well as myocardial ischemia. 1. Chronic pulmonary hypertension: mainly functional factors lead to increased pulmonary vascular resistance, including hypoxia, hypercapnia and respiratory acidosis, which can cause pulmonary vasoconstriction, spasm, hypoxia and so on. It is recommended that patients should pay attention to the combination of work and rest, appropriate rest, pay attention to the regularity of life, actively prevent bacterial infections, pay attention to climate change, pay attention to warmth, prevent colds and flu, once respiratory infections should be treated as soon as possible, so as not to bring danger to the patients with pulmonary arterial hypertension. 2. Myocardial ischemia: insufficient blood and oxygen supply due to atherosclerosis and narrowing of the lumen of the coronary arteries. Because the symptoms of myocardial ischemia is mainly due to myocardial oxygen consumption increase or insufficient blood supply caused by the contradiction between supply and demand, so it is not recommended to patients with strenuous exercise, and long-term use of antiplatelet aggregation, nitrate and other drugs to increase the blood supply to the myocardium. Prevent further aggravation of myocardial ischemia, usually pay attention to low salt and low fat, light diet, do not eat too much greasy things, drink more water and eat more fresh fruits and vegetables, eat more soy products and beans, scientific and reasonable exercise health care, regular health checkups and so on.