Low T-wave changes are usually a type of cardiac vectorial change in the electrocardiogram. If the electrocardiogram shows low T-wave changes, it usually means that the heart has an inadequate blood supply, either physiologically or pathologically. For physiological changes, such as excessive stress, anxiety, or after taking strong tea or coffee, these conditions may occur. In addition, T-wave changes can also occur with poor rest or sleep. Pathological factors, such as endocrine metabolic diseases, such as thyroid dysfunction or ion disorders, such as hypokalemia and hyponatremia, as well as organic heart disease, such as coronary artery disease and myocarditis, can lead to T wave changes and hypotension.