T-wave hyperacusis is a condition in which the height of the T-wave on the ECG exceeds a certain range of the R-wave, i.e., the T-wave in the limb leads exceeds 0.5 mV and the T-wave in the chest leads exceeds 1.0 mV. There are many causes of T-wave hyperacusis, which is commonly associated with myocardial infarction, cerebrovascular disorders, hyperkalemia, etc. Some healthy people may also have T-wave hyperacusis, which may be caused by early cardiac repolarization. If you have an electrocardiogram, you need to combine the patient’s symptoms and medical history to find the cause. If there are symptoms of myocardial ischemia, such as chest pain and sweating, you need to visit the cardiology department promptly. If you have recently taken a lot of potassium-containing foods or medications, you may also have hyperkalemia, which requires electrolyte tests for further clarification.