ST-segment elevation is clinically common for the following reasons: first, variant angina, which is manifested as ST-segment elevation during angina attack and normalizes after the attack, mostly related to coronary artery spasm. Second, acute myocardial infarction, acute myocardial infarction is also manifested as ST-segment elevation, accompanied by severe chest pain, which cannot be relieved by itself and requires urgent coronary angiography and, if necessary, stent placement. Third, acute pericarditis, which can also present with ST-segment elevation on ECG, this elevation lacks the dynamic evolution of acute myocardial infarction, and examination of cardiac ultrasound helps to make a clear diagnosis. Fourth, acute viral myocarditis can also present with ST-segment elevation, usually with a history of pre-cold or diarrhea, and cardiac ultrasound and, if necessary, coronary angiography can help clarify the diagnosis.