First of all, I would like to introduce you to the hardest working organ of our body – the heart. The heart is a very important organ of our body, it is like a pump that never stops working, with each contraction of the heart will carry oxygen and nutrients to the blood flow through the aorta to the whole body, in order to supply the metabolic needs of various tissues and cells. “Coronary heart disease” is actually the abbreviation of coronary atherosclerotic heart disease, which is a heart disease caused by atherosclerotic lesions in the coronary arteries supplying the heart, causing narrowing or blockage of the arterial lumen, which further leads to insufficient supply of blood and oxygen to the heart muscle, or even necrosis. Coronary atherosclerotic heart disease is the most common type of atherosclerosis leading to organ lesions, but also a common disease in the middle-aged and elderly population, seriously jeopardizing human health. Coronary heart disease is divided into five main clinical types, namely asymptomatic myocardial ischemia, angina pectoris, myocardial infarction, ischemic cardiomyopathy, and sudden cardiac death. In clinical practice it is also often divided into stable coronary artery disease and acute coronary syndromes. Angina attacks manifest themselves differently in different people. Most people describe it as “chest pressure”, “stuffiness”, “stuffiness”, and some patients feel that it spreads to the shoulders, back, neck, and throat bilaterally, and is relieved by rest or nitroglycerin. Nitroglycerin can help. There is also a part of the elderly, coronary artery stenosis, although very serious, do not necessarily have the typical chest tightness, chest pain, palpitations and other clinical manifestations of coronary heart disease. Therefore, for people with chest tightness and chest pain as well as abnormal electrocardiogram, they should consult the cardiovascular internal medicine department to improve the examination of coronary heart disease, have no disease health care, and early treatment of disease to prevent and control the emergence of more serious situations.