T-wave hypoplasia is a diagnosis of vectorology on the electrocardiogram, which usually indicates pathological changes in the process of ventricular repolarization and cannot be diagnosed based on T-wave hypoplasia. There are many factors that lead to T-wave hypoplasia, as follows: 1. Usually cardiogenic diseases can lead to T-wave hypoplasia, such as patients with coronary atherosclerotic heart disease, unstable angina pectoris, or heart valve disease, patients with The T wave will be low if the patient has rheumatism, pulmonary heart disease, hypertensive heart disease. 2, the T wave will be low if the patient has cardiac vegetative neurosis. 3, ion disorders, such as hypokalemia, hypomagnesemia, the T wave will also appear low. 4, endocrine metabolic diseases, such as thyroid dysfunction will also occur when the T wave is low.