Angina pectoris can be divided into two categories: stable angina pectoris and unstable angina pectoris: 1, stable angina pectoris is mainly manifested as frequent activities or emotional excitement, episodes of retrosternal stab-like, knife-like or burning-like pain, and radiation to the precordial area and the left upper arm, accompanied by palpitations and chest tightness, each lasting several minutes, the symptoms can be relieved after rest or nitroglycerin. 2, unstable Angina pectoris refers to patients who have episodes of chest pain and chest tightness without a clear cause, with symptoms worsening with activity or exertion, prolonging the duration of chest pain and more frequent episodes of chest pain. If these patients are not given active treatment, the next step may develop into myocardial infarction, thus endangering the patient’s life.