An enlarged heart may not necessarily be heart failure, but also hypertension, heart valve disease, myocardial infarction, dilated cardiomyopathy, congenital heart disease and other diseases. 1. Heart failure: an enlarged heart may be heart failure, manifested by enlargement of the left and right ventricles, which is usually detected when the disease process is more serious. 2. Hypertension: long-term pressure load on the heart makes the left ventricle hypertrophied and enlarged, easily combined with coronary atherosclerosis and vascular lesions. 3. Heart valve disease: mitral stenosis, mitral valve closure insufficiency, aortic valve stenosis and closure insufficiency, etc. all make the cardiac hemodynamics change, long-term cause heart enlargement. 4. Myocardial infarction: old myocardial infarction can be seen in the left ventricle enlargement, long-term can lead to heart failure. 5. Other: such as congenital heart disease, the left ventricle can be seen enlarged, the right heart enlarged; cardiomyopathy (dilated cardiomyopathy, hypertrophic cardiomyopathy, etc.) can be seen heart enlargement. If heart enlargement is not treated in time, it may eventually develop into heart failure, and it is recommended to seek medical treatment as soon as possible.