Low voltage in the limb leads of ECG may belong to physiological conditions, in which case it does not matter, or it may belong to pathological conditions, in which case it needs to be treated. 1. Physiological conditions: if there is obesity, weak body, dry skin, etc., may appear limb lead low voltage, usually do not need to carry out special treatment. 2. Pathological conditions: If there is heart failure, emphysema pleural effusion, myocarditis and other diseases, it will cause low voltage in the limb leads. In this case, further examination should be carried out to find out the cause of the disease and then further treatment. If it is simply caused by physiological conditions, there is no need to worry, if it is caused by diseases, it is recommended to go to the hospital in time for treatment. In daily life, pay attention to rest, appropriate exercise, and enhance the resistance.