The main symptoms of T-wave changes include chest tightness, shortness of breath, precordial pain, dizziness, black haze, etc. T-wave changes include T-wave hyperacusis, T-wave hypoplasia, and T-wave inversion. T-wave hyperacusis can be seen in hyperkalemia, often combined with severe bradycardia, and symptoms include chest tightness, dizziness, black haze, etc. Acute myocardial infarction is also characterized by hyperacute T waves with a narrow base. Patients may experience persistent precordial pain, with a feeling of suffocation, clenching, and more intense pain, often accompanied by a sense of near death and profuse sweating. In contrast, low and inverted T waves can be seen in myocardial ischemia, electrolyte disorders such as hypokalemia and hypocalcemia, and also in normal variants. In some adults, the ECG presents with T-wave inversion in leads v1-v4 without any symptoms and a negative exercise plate test is considered a congenital variant. In some adults with T-wave changes and no obvious symptoms, it is recommended to check electrolytes and perform an exercise plate test if necessary.