Inadequate blood supply to the heart is often a more serious condition, while mild cases of inadequate blood supply to the heart have no obvious abnormalities. Inadequate blood supply to the heart can lead to a state of myocardial infarction and even to sudden death. Patients with myocardial infarction have severe chest pain that lasts for a long time, often more than half an hour, and is accompanied by nausea, vomiting, cold sweats, decreased blood pressure, shock, heart failure and other related symptoms, which can cause malignant arrhythmic events and even trigger sudden death. Inadequate blood supply to the heart is also seen in young women, suggesting myocardial ischemia during electrocardiogram, but without obvious symptoms, which may be associated with excessive fatigue, mental stress, etc., often without obvious serious consequences. Therefore, the severity of insufficient blood supply to the heart needs to be judged on the basis of whether it has organic heart disease.