Angina pectoris in clinical practice generally refers to angina pectoris, which can be life-threatening. In the case of stable angina, the attack is not life-threatening if rest is taken immediately after the attack and crown-dilating drugs are used, while unstable angina can induce malignant arrhythmia or myocardial infarction, which can be life-threatening. Angina is usually a sudden onset of dull, crushing or suffocating pain following the middle or upper part of the sternal body, which may radiate to the left shoulder and even the left little finger and ring finger, and may force the patient to stop activity immediately. The pain lasts roughly 1-5 minutes and is quickly relieved by rest or nitroglycerin. Angina pectoris usually occurs when you are cold, tired, full, emotional and smoking, mostly in diabetic or elderly patients, but due to the accelerated pace of life, angina pectoris has a tendency to be younger. Once angina is present and not relieved by oral nitroglycerin, you should seek medical attention and undergo coronary angiography to choose the treatment according to the test results, and in severe cases, immediate intervention or surgery is required. In addition, patients who have had angina should avoid strenuous exercise in their daily life to avoid increased oxygen demand of the heart, which may trigger an attack.