The general public should pay attention to the following aspects in identifying angina: First is the nature and range of sites of angina. Many people have misconceptions about angina. Angina seems to be literally a very sharp pain, like a pinprick, but in fact this is a misconception. The typical nature of angina is a dull pain in the chest, tightness, blockage, or vague discomfort. Pinprick pain is usually neuropathic and is not associated with cardiac ischemia. However, patients with angina can have this neuropathic pain at the same time. So it is important to distinguish between these two types of pain. Many people think that angina should be present on the left side of the chest, but in fact typical angina should be in the middle of the chest. Of course, the site of angina can go up to the jaw area and down to the upper abdomen. This is why it is sometimes misdiagnosed as toothache or stomach problems, and treatment is delayed. Angina is usually the size of the palm of your hand. It will not be a small area of one spot. It is also important to note that the nature and extent of angina is usually relatively constant for each individual and does not vary. While the nature and extent of angina is important in identifying angina, what is more important is the timing, duration and relief of the chest pain. Angina usually appears during exercise exertion, such as running, going upstairs, or lifting heavy objects. It lasts for 3-5 minutes. Rest with nitroglycerin for 1 minute can relieve it. If the chest tightness appears at rest and is relieved during exercise. Then it is not like angina pectoris. Some patients have chest tightness that lasts for a long time and does not affect daily activities, which is also not like angina pectoris. Of course, if there are symptoms of chest pain and tightness, going to the hospital to see a doctor is a must. Because there are many atypical myocardial ischemia. It is necessary for our doctors to make a diagnosis with the help of equipment and devices. For example, electrocardiogram, exercise test, coronary CTA or coronary angiography, etc.