Left ventricular hypertrophy can be dangerous. Left ventricular hypertrophy is an abnormal state of the heart that, if allowed to progress, may eventually lead to heart failure. The most common cause of left ventricular hypertrophy is high blood pressure. In patients with high blood pressure, the heart is heavily burdened and the heart muscle is overworked, which can lead to left ventricular hypertrophy and dilation, called hypertensive heart disease. The original function of the hypertrophied myocardial cells is affected, causing a decrease in the blood flow reserve of the heart’s coronary arteries. When the body exercises vigorously, the oxygen consumption increases, the contraction capacity of the heart decreases, the ejection of blood is reduced, and the body’s needs cannot be met, which will eventually develop into heart failure. In addition, coronary artery disease, aortic stenosis and cardiomyopathy can also lead to left ventricular hypertrophy and should be actively treated in a targeted manner to prevent the development of heart failure. After the patient is diagnosed with left ventricular hypertrophy, it is recommended to keep a calm mind, no need to be overly nervous, quit smoking and limit alcohol, and be properly active to enhance body resistance and avoid illnesses such as colds that can induce viral infections.