It is common to see limb lead hypovoltage described on the ECG, which is actually a technical term to describe the ECG. In a normal six limb leads, the QRS wave group voltage (arithmetic sum of R+S or Q+R) in each lead is greater than 0.5 mV. If it is less than 0.5 mV, it indicates a low voltage, which can be a physiological condition or can indicate the possible presence of some disease. If the ECG has only limb conduction low voltage, no other abnormalities and no discomfort, no intervention is needed, which can occur in a few normal individuals. It can also be seen in cardiac conditions such as pericardial effusion, myocarditis, and pericarditis, and in conditions other than cardiac conditions such as obesity, emphysema, pleural effusion, skin edema, dry skin, and pneumothorax.