Insufficient blood supply to the heart is myocardial ischemia, myocardial ischemia is mainly due to the narrowing or spasm of the coronary arteries, resulting in myocardial ischemia, hypoxia, which produces a series of symptoms, with angina pectoris, chest tightness, panic and shortness of breath as the main manifestations. The patient suffers from squeezing, tightness and cramping pain behind the sternum and the back, which radiates to the left shoulder, left arm and even the little finger and ring finger of the left hand. Once insufficient blood supply to the heart occurs, it is necessary to go to the hospital to assess the severity of the condition through laboratory tests as well as auxiliary tests to determine the next step in the treatment plan, such as conservative treatment with medication, coronary stent implantation surgery, and surgical open-heart bypass grafting surgery, all of which can alleviate the symptoms of myocardial ischemia.