Acute myocardial infarction and angina differ as follows: 1, symptoms: acute myocardial infarction chest pain and chest tightness lasting more than half an hour, angina lasting within a few minutes, not more than 30 minutes can be relieved; 2, ECG performance: acute myocardial infarction ECG will appear a series of dynamic evolution, such as T-wave hyperacute, ST-segment elevation, arch back up, the emergence of pathological Q waves or extensive ST-segment depression, T-wave Inversion, angina ECG performance is temporary, with ST-segment depression and T-wave inversion as significant manifestations; 3. Test results: myocardial enzymes and troponin are significantly elevated in acute myocardial infarction, while angina myocardial enzymes and troponin are in the normal range; 4. Prognosis: Patients with acute myocardial infarction will suffer a serious blow to cardiac function if they are not actively treated, which in turn will lead to death, and patients with angina can be relieved on their own. However, patients with recurrent angina attacks still need to seek timely medical attention to avoid progression to the critical state of acute myocardial infarction.