The causes of mild ST-T abnormalities are as follows: 1. Insufficient blood supply to the myocardium: most consider the existence of diseases caused by insufficient blood supply to the myocardium, such as coronary heart disease, angina pectoris attack, prone to electrocardiogram changes; 2. Chronic diseases: such as anemia or cardiomyopathy, congenital heart disease, abnormal changes may occur; 3. Poor work and rest: some people due to abnormal work and rest schedules, such as frequent night shifts, staying up all night, and overnight ST-T abnormal changes. ST-T abnormality is mainly due to pathological and physiological reasons, physiological direction to consider whether daily rest is good, whether the heart has rest time. If there is a disease, the main investigation of the original pathology, such as coronary heart disease, check whether there is blood vessel stenosis, spasm. ST-T abnormality can indirectly reflect the heart or other parts of the body may have damage, need to find the original cause of the disease.