Sudden death originates from disease, and generally speaking, sudden death belongs to disease death, not accidental death. Sudden death is mostly closely related to some disease states, such as long-term in a high-intensity work environment, resulting in insufficient blood supply to the heart muscle, or the patient has some underlying diseases, such as coronary heart disease, myocarditis, primary heart disease, etc., which are prone to sudden death. Although there may not be any signs before sudden death, just in sleep or work environment will suddenly die, but is not an accident. Most of the known accidents are due to electric shock, drowning, car accidents, trauma, etc. Sudden death occurs suddenly, that is, the patient himself cannot anticipate the time of sudden death. Most sudden deaths occur outside the hospital setting, and it is difficult to get some professional treatment in a short time, so sudden death is a sudden event.