Left ventricular hypertrophy as indicated by ECG should be on the alert for hypertension, aortic stenosis and coronary artery disease. 1. Hypertension: When blood pressure continues to rise, the pressure load may increase, leading to an increase in catecholamines in the blood, which may cause left ventricular hypertrophy when the condition progresses further. 2. Aortic stenosis: when the degree of aortic stenosis increases, the load on the left ventricle will increase significantly, if it can not be relieved easily lead to heart failure, further aggravation of the condition will cause ventricular hypertrophy. 3. Coronary heart disease: clinically known as coronary atherosclerosis, when the condition is serious, resulting in myocardial ischemia, resulting in ventricular enlargement, may induce ventricular hypertrophy. If the electrocardiogram suggests ventricular hypertrophy, it is recommended to do a cardiac ultrasound as soon as possible to find out whether there are organic lesions, and then according to the diagnosis of the results of formal treatment.