There are several factors that can cause coronary heart disease at the age of 20: congenital malformations of the coronary arteries, congenital stenosis of the coronary arteries, which can induce acute myocardial infarction during strenuous exercise. Coronary heart disease can appear in people with a family history of genetic disease, and such people usually have varying degrees of family history, so they are susceptible. Secondly, it is directly related to irregular lifestyle habits and poor diet structure. In addition, people who experience sympathetic over-excitation, mental over-stimulation, over-fatigue, poor sleep and excessive stress are also prone to activation of sympathetic nerves causing coronary artery disease at this time. At the same time, if long-term in high salt, high sugar, high fat diet, and cause increased blood lipids, blood pressure, obesity, insulin resistance, such people will also be in their 20s easy to appear coronary heart disease