Old age, sickness and death are natural laws that no one can escape from, but we need to have a psychological acceptance process. If a family member dies suddenly, it is normal for the loved ones to be psychologically unable to accept it for a while. Nowadays, people live in better conditions and pay more attention to health, most people have the habit of regular medical checkups. But there are some people who usually have normal medical checkups, but the same happened to the accident of sudden death. This makes people very do not understand. Why would there be a physical examination shows nothing, but still occurred sudden death? To solve this problem, you need to start from the following aspects: 1. What is sudden death? Sudden death, mostly cardiac sudden death, is a natural death characterized by loss of consciousness within one hour of the appearance of acute symptoms and caused by cardiac causes. 90% of sudden cardiac deaths are due to cardiac arrhythmias. 2.What are the usual physical examination items? General physical examination includes general electrocardiogram, ultrasound of liver, gallbladder and spleen, liver and kidney function, blood lipid, blood sugar, blood and urine routine, etc. Female physical examination also adds gynecological physical examination. 3, for sudden death, many examination items are not included in the routine examination, such as cardiac ultrasound, dynamic electrocardiogram, ventricular late potential examination, etc.. Even if the electrocardiogram examination is performed, it can not make a judgment on whether there is coronary heart disease, and to find out whether there is coronary heart disease, you need to do coronary CT imaging. 4, the “gold standard” coronary CT is not used as a routine physical examination, but coronary CT is expensive and radioactive, and has certain damage to the body, with strict adaptability. So doctors will not let patients do coronary CT at will, must be combined with clinical symptoms after a comprehensive judgment to do, the general medical examination will not include this test. 5, sudden death occurs not only because of the narrowing of blood vessels caused by coronary artery disease, but very often because of the rupture of unstable plaque on the blood vessels, causing the blockage of blood vessels. And this sudden situation is not detected by the physical examination. This makes it clear that not all sudden deaths can be detected by routine medical examinations. But sudden death, in fact, can be prevented! Note that there are six high-risk groups of sudden death, including white-collar workers under pressure, men over 40 years old, women over 50 years old, media or IT industry workers, people who often stay up late, obese with sleep apnea, etc. When these high-risk groups have chest tightness, chest pain, and difficulty in breathing, be alert to the precursors of sudden death, and be sure to go to the hospital as soon as possible.