Mild alteration of the T-wave is a term used for an ECG, a waveform of the ECG that represents the change in potential during rapid repolarization of the ventricles. When myocardial ischemia occurs, the repolarization process is altered and T-wave changes appear on the electrocardiogram; if the T-wave changes are low, such as slightly low frequency in amplitude, they can be called mild T-wave changes. Generally, mild T-wave changes suggest a transient lack of blood supply to the myocardium or slight damage to the myocardium, suggesting that there may be a slight mild myocardial lesion or myocardial injury. Through active symptomatic treatment, increase myocardial oxygen supply, improve myocardial energy metabolism, and improve myocardial ischemia or myocardial blood supply insufficiency. Most of the mild T-wave changes can be recovered within a short period of time. Mild changes in T-wave indicated by ECG should be promptly consulted and actively treated.