Non-specific ST-segment elevation means that the ST-segment elevation does not meet the diagnostic criteria for characteristic ST-segment elevation myocardial infarction. In addition, non-specific ST-segment elevation may appear in a single lead and not in two or more adjacent leads, so it is not sufficient to diagnose ST-segment elevation myocardial infarction. For ST-segment elevation, which is commonly seen in patients with coronary artery disease and myocardial infarction, patients may present with symptoms of chest pain that is severe and lasts for a long time, often more than half an hour, and may be accompanied by nausea, vomiting, profuse sweating, decreased blood pressure, shock, and heart failure. Based on the condition of ST-segment elevation leads on the ECG, it is possible to roughly determine which branch of the coronary artery has interrupted blood flow, which can be used to guide treatment.