Most patients with acute myocardial infarction have chest pain as the first manifestation, not only chest pain of course, but also chest tightness, shortness of breath, and then pain, chest tightness or shortness of breath for a longer period of time, which cannot be relieved by nitroglycerin. Some patients do not have typical chest pain at the onset of the disease, but some other manifestations, which can only be detected by electrocardiogram and myocardial enzyme profile, with special emphasis on dynamic observation, observing the evolution of electrocardiogram and myocardial enzyme profile. Some patients may not have any episodes of chest pain throughout the course of the disease, but when the ECG is done during physical examination, there are some typical manifestations of acute myocardial infarction, such as Q-wave localization, especially some ECG changes in localization, which suggest the presence of old myocardial infarction, or they may be found to have had myocardial infarction only during coronary angiography, while some atypical manifestations of painless myocardial infarction are stomach pain or arthralgia. symptoms.