Approximately 1/2 to 2/3 of patients will have certain omens appearing 1 to 2 days or 1 to 2 weeks or even longer before the onset of myocardial infarction. Paying more attention to these aura symptoms in general can minimize the occurrence of myocardial infarction, or minimize the danger of myocardial infarction. ①Sudden recurrent attacks of angina pectoris with a heavy degree and a long duration, when you are normally healthy. ②The symptoms of angina pectoris are frequent, severe, and prolonged in duration, and cannot be relieved by rest or nitroglycerin. (③The angina was easy to attack during activity in the past, but later became angina at rest or at night. (4) Angina attack with arrhythmia and profuse sweating, nausea, vomiting, etc. ⑤ Angina attack combined with obvious symptoms of cardiac insufficiency such as dyspnea, inability to lie down and coughing. ⑥The original myocardial infarction has long been healed, and then sudden onset of severe angina pectoris. (7) There are obvious changes in myocardial ischemia on the ECG compared to a few weeks ago, especially the presence of transient ST-segment elevation and depression and T-wave elevation or inversion, which should be especially alarming. If you encounter one of these conditions, you should immediately go to the hospital for examination and prompt hospitalization.