The most common cause of sudden and unexpected death in young people is sudden cardiac death. With the improvement of living standards, the incidence of acute myocardial infarction in young people is also in the minority. Acute myocardial infarction can easily trigger agitation, malignant arrhythmia, and even sudden death. Pulmonary artery embolism is due to the dislodgement of a blood clot that suddenly blocks a pulmonary vessel. If the blockage site is in the large blood vessels of the lung, it can easily lead to acute ischemia and hypoxia of the body and fatal sudden death. Severe myocarditis, cardiomyopathy, heart valve disease, rheumatic heart disease, etc. are also prone to sudden death if they are complicated by heart failure and various arrhythmias. Therefore, young people should also raise awareness of sudden death prevention.