The thickness of the posterior wall of the left ventricle of 13mm is not normal and may be caused by hypertension or congenital factors. The heart consists of the left atrium, right atrium, left ventricle and right ventricle, in which the myocardium and connective tissue at the back of the left ventricle constitute the ventricular wall, called the posterior wall of the left ventricle, the thickness of the posterior wall of the left ventricle is between 8mm and 10mm under normal circumstances, and the thickness of the posterior wall of the left ventricle is not normal when the thickness of the posterior wall of the left ventricle is 13mm. Due to genetic factors can cause congenital ventricular wall hypertrophy, adults such as hypertension, in the role of long-term high blood pressure can make the ventricular wall gradually hypertrophied, up to 13mm or even higher, but under normal circumstances will not immediately cause serious consequences, there will be no obvious symptoms, but also should be actively treating the underlying diseases, to avoid the disease continues to develop dilated cardiomyopathy and so on. It is recommended that regular follow-up, regular hospital treatment.