The left deviation of EKG can have many reasons, such as short and fat body, or left ventricular hypertrophy and other pathological factors, should identify the cause of the disease and treat the cause. 1. Short and fat: Generally, short and fat people’s EKG tends to be left deviation, while tall and thin people’s EKG tends to be right deviation, at this time, there is no need to take special measures. 2. Left ventricular hypertrophy: the left deviation of the electrocardiographic axis often suggests left ventricular hypertrophy, and the diseases that cause left ventricular hypertrophy can be hypertensive heart disease, aortic valve lesions, mitral valve insufficiency and so on. In this case, we should start from the primary disease that causes the left deviation of the electrocardiographic axis, so as to slow down the progress of ventricular hypertrophy. For hypertensive heart disease, timely control of blood pressure is needed, and relevant antihypertensive drugs can be selected under the guidance of doctors, commonly used beta-blockers such as metoprolol, propranolol, etc. For valvular lesions, heart valve replacement surgery can be performed in severe cases. The left deviation of the cardiac axis should be actively identified as the cause of the disease, to clarify whether there is coronary heart disease, cardiomyopathy, heart valve disease, etc., and actively treat the primary disease under the guidance of the physician.