Some of the T-wave changes may be cardiac disorders such as myocardial ischemia and myocardial infarction. It may also be due to electrolyte disorders, such as hypokalemia. Partial T-wave alteration suggests an abnormal ECG. Each waveform in the ECG has a normal range, and if the T-wave is out of the normal range, it is called T-wave alteration. Partial T-wave changes are changes such as low flatness and inversion of T-wave in some leads in 12 or 18 leads of ECG, which also suggests the possibility of myocardial ischemia, myocardial infarction and other diseases. It is necessary to improve the cardiac ultrasound, cardiac enzymes, coronary artery CT or coronary angiography, etc., in combination with age, medical history, symptoms, etc., in order to clarify the presence of cardiac disease and the nature and severity of cardiac disease, and to guide the treatment modality. In addition, T-wave changes can also be seen in electrolyte disorders, such as hypokalemia, it is recommended to go to the hospital in time to take blood tests to clarify the specific situation.