Symptoms of acute myocardial infarction are mainly characterized by a sudden onset of squeezing pain or stuffiness in the precordial region that lasts for more than 30 minutes. Typical symptoms of acute myocardial infarction are precordial pain or a feeling of suffocation that lasts for a long time, usually more than 30 minutes, and cannot be alleviated by rest and nitroglycerin. After the occurrence of acute myocardial infarction, at first, due to the decrease of myocardial perfusion, heart rate accelerates and blood pressure rises. Later on, due to the increase of myocardial necrosis and the decline of heart function, there will be slow heartbeat, dyspnea, blurred consciousness and other shock manifestations. In acute myocardial infarction, attention should be paid to timely unblocking of coronary arteries to reduce the heart load, absolute bed rest to reduce external stimuli, oxygen intake, and avoid emotional fluctuations. When the patient has the above symptoms, it is recommended to consult a doctor in time to avoid delayed treatment.