High voltage in the left ventricle may be due to the presence of an enlarged left ventricle, ventricular hypertrophy, etc. This condition has an impact on human health and may lead to cardiac insufficiency, heart failure, etc., and further examination is needed to clarify the cause. A common cause of LV enlargement and ventricular hypertrophy is high blood pressure. As blood pressure rises, the heart needs stronger contraction force to supply blood to all organs of the body, resulting in LV enlargement and ventricular hypertrophy, which induces hypertensive heart disease. If the left ventricle is enlarged and the heart is hypertrophied, it can lead to left heart insufficiency, causing arrhythmia, and in more serious cases, heart failure, which can be life-threatening. Left ventricular high voltage is a manifestation of electrocardiogram. If electrocardiogram reveals high voltage in the left ventricle, it is necessary to do cardiac color photography for clear diagnosis, observing whether there is any ventricular enlargement, ventricular hypertrophy and so on, so as to diagnose whether it is hypertensive heart disease or not. Left ventricular high voltage accompanied by physical discomfort, should be timely consultation, under the guidance of the doctor for targeted treatment.