Frequent chest pain and chest tightness, the most common disease is coronary heart disease, coronary heart disease includes angina pectoris, myocardial infarction and many other types, and angina pectoris includes stable angina, unstable angina and variant angina. Frequent chest tightness and chest pain are mostly considered as unstable angina. Unstable angina often has the possibility of developing into myocardial infarction, and manifests as persistent chest pain, which is severe and lasts for a long time, often more than half an hour, and can be accompanied by nausea, vomiting, cold sweat, drop in blood pressure, shock, heart failure and other symptoms. For patients with coronary artery disease and acute myocardial infarction, treatment requires rapid release of the causative obstruction, as well as improvement of the ischemic and hypoxic state of cardiac muscle cells. The treatment includes medication, coronary intervention, and emergency surgical bypass surgery.