Coronary heart disease is a big disease at present, with three meanings: first, the number of patients, second, the disease is serious and has a poor prognosis, third, the medical costs are high, so it is called a big disease, other big diseases or tumors, blood diseases, etc.. Coronary heart disease diagnosis mainly relies on: (1) symptoms, such as episodes of chest pain, panic, shortness of breath (dyspnea), “toothache”, “neck pain”, “epigastric pain”, etc.; (2) Take to relieve the previous symptoms, at present, nitroglycerin relief is the main, followed by relief after rest, but it is considered that it should be relieved within a specified time (usually within 5 minutes mostly, but rarely to more than 10 minutes); (3) physical and chemical examination: among them, exercise test, cardiac coronary CT, coronary angiography, isotope scan shows that there is a coronary artery narrowing to a certain degree or evidence of ischemia. Self-identification of coronary artery disease from symptoms is difficult, because coronary artery disease includes several types and the clinical manifestations are sometimes not very characteristic. So most cases are inferential. For example, an attack at rest that is relieved by activity may not be coronary heart disease; a duration of more than one hour without remission, but without evidence of myocardial infarction, may not be coronary heart disease. It is less likely that heart panic (premature beats) in young people is coronary heart disease, and more likely in middle-aged and elderly people. For each patient, when they can’t judge by themselves, the risk of dealing with them according to coronary heart disease is minimal, so don’t force self-identification, you can deal with them according to coronary heart disease first and then seek medical attention. The principles of treatment, symptoms can generally be first used herbal quick-acting preparations, serious suspected myocardial infarction can be used aspirin, if there is no hypotensive problems generally preferred to nitroglycerin sublingual.