Chest pain is very common and can be caused by many reasons, often making people ignore it, but it often indicates serious heart or lung disease, or is one of the most important and dangerous signs of heart disease aggravation, the most dangerous of which are angina pectoris and myocardial infarction, which are different manifestations of different stages of coronary heart disease development. Coronary heart disease is a condition in which the blood vessels supplying the heart itself, namely the coronary arteries, are blocked by plaque formation, resulting in myocardial ischemia and, in severe cases, myocardial necrosis. Mild to moderate blockage leads to poor blood supply to the heart and angina pectoris. Severe and sudden blockage leads to complete cessation of blood flow and myocardial necrosis, which is often referred to as myocardial infarction. The chest pain of angina is mostly confined to the lower middle part of the sternum (the middle and lower part of the chest) or the left side of the chest, but in some patients the location is atypical, especially in the elderly, and can occur in any area from the lower jaw to the upper abdomen. The chest pain is about the size of a palm, mostly occurs with activity or emotional agitation, and is mostly dull, crushing or tight, at which point the patient often has to stop activity until the pain is relieved, which mostly lasts 5 to 15 minutes to relieve, with nitroglycerin or cardioplegia, which can start to gradually relieve after 2 minutes. The nature and location of chest pain in myocardial infarction is approximately the same as angina, but the degree is more severe, the patient often has a sense of frequent death, irritability, sweating, fear and often occurs in the early morning or in a quiet state, the pain can last for half an hour to more than a few hours, at this time, nitroglycerin or cardioplegia is often ineffective. Once chest pain of the above nature occurs, strongly suggesting coronary heart disease, you should not hesitate to call 120 emergency number, because once the coronary artery is blocked, in less than 2 hours, myocardial necrosis will occur irreversibly, and if you do not get timely treatment to open the occluded blood flow, the patient’s life will be in danger. At this time, it is crucial to restore blood flow as quickly as possible, and it can be said that “time is myocardium and myocardium is life”. Therefore, it is important to choose a hospital that has the ability to perform emergency coronary intervention at this time. Such a large hospital can open the occluded vessel and restore blood flow within 90 minutes by using vascular intervention, which is often called stent treatment, thus saving lives in a close call.