The length of survival of patients with angina is related to the degree of myocardial ischemia. Mild patients can survive for years to decades with standardized treatment, while severe patients are at risk of sudden death. Angina pectoris is triggered by myocardial ischemia and is characterized by crushing pain in the anterior chest region with a sense of dying, which may be associated with tenderness and is partially relieved by oral nitrate preparations (e.g., nitroglycerin, etc.). For patients with mild myocardial ischemia, conservative treatment can improve ischemia, relieve symptoms, prevent infarction, and generally can survive for several years to decades, which may not affect the patient’s life expectancy. For patients with severe myocardial ischemia, they need to be treated with medication and interventional surgery, and their survival can be greatly prolonged by treatment and postoperative scientific care. For patients with angina pectoris must be actively treated to prevent the occurrence of infarction, once infarction occurs if the treatment is not timely, there is a risk of sudden death.