The diseases that are prone to sudden death are the following: First, when coronary atherosclerotic heart disease is combined with acute myocardial infarction, the patient’s heart pumping function decreases dramatically, and the patient is prone to the risk of cardiac arrest and sudden death. Second, various types of malignant arrhythmias, such as third-degree atrioventricular block, frequent multi-source ventricular premature, ventricular tachycardia, ventricular fibrillation, etc. will lead to a decrease in the ejection volume of the patient’s heart and insufficient blood supply to the myocardium, and the patient will suffer sudden death. Third, hypertension causes cerebral aneurysm rupture and bleeding, when the patient’s intracranial pressure rises sharply, brain tissue edema, brain herniation and sudden death can easily occur. Fourth, severe hypoglycemia, mostly seen in diabetic patients applying hypoglycemic drugs overdose or eating too little, severe hypoglycemia will lead to sudden death due to insufficient energy supply to the heart and brain.