In many people’s impression, myocardial infarction is a serious disease, and some people find abnormal Q waves during physical examination, and the doctor tells him that he may have had myocardial infarction, so he is nervous as hell, thinking that he has a serious disease and is in danger. In fact, it is not necessary, because myocardial infarction is only quite dangerous in the acute stage, but once it becomes old myocardial infarction, the danger is greatly reduced, and asymptomatic Q waves just signify that myocardial infarction has become old. Obsolete myocardial infarction without angina symptoms can be treated according to the principles of coronary artery disease treatment, such as taking drugs like aspirin and beta-blockers. If angina is present, it means that in addition to the blocked blood vessels, there are narrowed blood vessels causing myocardial ischemia. In this case, in addition to medication, coronary angiography should be done to understand the condition of the coronary arteries in order to decide whether to perform PCI or bypass surgery. Because the presence of post-infarction angina makes the chance of another infarction and sudden death increase, its risk is much greater than other types of angina, and should be paid extra attention.