The aura of infarction occurs in 50% to 81.2% of patients a few days before the onset of the disease, and usually consists of six manifestations: chest discomfort, fatigue, irritability during activity, palpitations, shortness of breath, and angina pectoris. The most prominent symptoms are new onset angina (first-onset angina) or aggravation of existing angina (worsening angina). Angina attacks tend to be more frequent, longer lasting, and more severe than before, with no nitroglycerin efficacy and no obvious precipitating cause. At the same time, the electrocardiogram shows a transient marked elevation (variant angina) or depression of the ST segment, and inversion or elevation of the T wave (“pseudonormalization”), i.e. unstable angina. In this case, it is important to hospitalize the patient and seek medical attention as soon as possible in order to avoid delayed treatment.