The symptoms of coronary artery disease are so variable that even experienced cardiologists can get caught in the gutter. But as long as the characteristics of a typical angina attack are grasped, most coronary heart disease can be identified. A. Stable angina The characteristics of a typical angina attack include the following five aspects: 1. Site: The typical site of angina is after the upper or middle part of the sternal body, which can spread to the precordial area, about the size of a fist or palm, or even across the anterior chest, and the boundaries are not very clear. It may radiate to the left shoulder, the medial left arm, the pharynx, the mandible, the teeth, and the upper abdomen, among others. In general, the pain site is relatively fixed for each attack. 2. Nature: It is often pressure-like or crunch-like pain, or burning-like or dull pain, but it is not sharp, and is rarely described as pinprick-like or knife-like pain. It is often accompanied by anxiety or fear of dying. It is also not uncommon to complain of chest tightness and tightness during an attack. Angina attack, the patient often unconsciously stop the original activity until the symptoms are relieved. 3, triggers: the most common triggering factors are physical activity or emotional excitement (such as anxiety, anger, overexcitement, etc.). Full meals, bowel movements, cold, smoking, tachycardia or bradycardia, high or low blood pressure, shock, etc. can also trigger it. The pain occurs at the time of exertion or excitement and not after a day or bout of exertion. Typical angina often occurs under similar conditions. 4.Duration: Angina often gradually worsens after appearing, gradually decreases and disappears within 3 to 5 minutes, and rarely exceeds 15 minutes, if more than 15 minutes should be considered the possibility of acute myocardial infarction. 5. Relief mode: Generally, it can be relieved after stopping the original symptom-triggering activities, and sublingual nitroglycerin can also be relieved within 3 minutes. Acute myocardial infarction If the symptoms of angina pectoris persist for more than 15 minutes, you should consider the possibility of acute myocardial infarction, regardless of when and where you are, you should immediately go to a local hospital that is equipped to perform emergency stent implantation. Unstable angina 1. Primary exertional angina: new angina occurring within 1 month and induced by a lighter load. 2, worsening angina: the original stable angina, within 1 month symptoms aggravated, including the frequency of pain, the degree of aggravation, the duration of prolongation, the degree of physical activity induced angina reduced, the alleviating effect of nitroglycerin weakened. 3, spontaneous angina: angina that occurs at rest, often lasting more than 20 minutes. 4, recumbent angina: angina that occurs at night while sleeping, often lasting more than 20 minutes. 5.Post-myocardial infarction angina: angina that occurs within 2 weeks of the diagnosis of myocardial infarction. The above five types of angina are all unstable angina. Although some of the names are not advocated in textbooks anymore, I think these terms help to understand the different manifestations of unstable coronary artery disease, so they are still listed for your reference. Patients with unstable angina should seek early medical attention because it can rapidly turn into acute myocardial infarction or sudden death.