Insufficient blood supply to the heart may not necessarily be coronary heart disease. There are many reasons for insufficient blood supply to the heart, such as recent poor sleep or poor diet, which may cause insufficient blood supply to the heart, in which case it is not coronary heart disease. Insufficient blood supply to the heart is a very general diagnosis, some will be based on clinical symptoms as the basis for diagnosis, such as frequent chest tightness, shortness of breath or panic attacks, it can also be considered that there is insufficient blood supply to the heart. The diagnosis of coronary heart disease must be found through cardiac imaging, and can only be recognized as coronary heart disease if there is a narrowing of the blood vessels of the heart, and this narrowing is more than 50%. Coronary heart disease must be insufficient blood supply to the heart, but on the other hand, insufficient blood supply to the heart may not be coronary heart disease, because there are many reasons affecting the blood supply to the heart, such as anemia, high blood pressure or hypothyroidism, which can all cause insufficient blood supply to the heart.