Angina and infarction belong to different types of coronary atherosclerosis, and the main differences are clinical symptoms, electrocardiographic manifestations, and changes in markers of myocardial damage. However, no matter which disease they suffer from, patients should go to the cardiology department immediately.1. Clinical symptoms: The degree of angina is lighter than infarction, usually triggered by exertion or emotional excitement, usually in a few minutes to more than 10 minutes, usually not more than 30 minutes, the nature of the pain is mostly colic or dull pain, located in the precordial area in the size of a palm, which can be relieved by rest or nitroglycerin. In contrast, the pain of myocardial infarction is more severe than angina, and the nature of the pain can also be colic or crushing pain, which usually lasts longer and cannot be relieved by the patient. There is ST-segment depression in at least 2 adjacent leads. In patients with angina pectoris, because the degree of myocardial ischemia is not as intense as that of infarction, the ECG can usually be normal, or there can be mild ST-segment depression; 3. Myocardial injury markers: myocardial infarction will result in various myocardial necrosis, and at the same time, various myocardial enzyme markers will be released into the blood, so some common myocardial injury markers will be significantly elevated during infarction, such as myoglobin and creatine kinase isoenzyme. However, patients with angina pectoris usually do not show symptoms of elevated markers of myocardial injury. These are the main clinical differences between the two. In addition, they can be further confirmed by coronary angiography, which shows that patients with infarction have 100% occlusion of the coronary arteries, which can induce myocardial ischemic necrosis, while patients with angina pectoris usually have moderate to severe coronary stenosis, and usually do not have complete occlusion.