If an ECG shows ST-segment elevation, this is usually most often due to the presence of coronary artery disease or unstable angina. In severe cases of acute myocardial infarction or acute coronary syndrome, ST-segment elevation is particularly noticeable. In addition, other factors may cause ST-segment elevation, such as poisoning caused by various factors, such as organophosphorus poisoning, acute carbon monoxide poisoning, and food poisoning, causing toxic cardiomyocyte damage, which may also manifest as ST-segment elevation. Finally, in the case of acute myocarditis, pericarditis, and acute infective endocarditis, the ST segment is also elevated. In addition, ST-segment elevation may also occur in patients with disorders of water-electrolyte and acid-base balance and ionic disorders in the body.