Precursor symptoms before myocardial infarction are mainly the manifestation of insufficient blood supply due to abnormal heart function, and patients often manifest precursor symptoms such as fatigue, chest pain, chest tightness, irritability, and epigastric pain. Most people will experience precursor symptoms such as fatigue, anterior chest discomfort, panic and chest tightness after activity, shortness of breath, irritability, etc. one month before myocardial infarction. Some people will experience epigastric pain before the onset of a heart attack, and most people will think that this symptom is caused by gastric problems and not pay enough attention to it, which will lead to a heart attack. Therefore, epigastric pain can be a precursor symptom of heart attack. If the patient has a history of angina pectoris, and the recent angina attacks are more frequent, the pain is more severe, and the oral nitroglycerin cannot relieve the pain, it is also often suggestive of myocardial infarction. If the above symptoms occur, you should consult a doctor in time, and improve the ECG and other tests can help diagnose and save myocardial function in time to minimize the serious consequences of myocardial infarction.