A large heart is a type of disease in which the heart chambers are enlarged or the heart muscle is hypertrophied; there are many possible causes of a large heart, including heart enlargement and heart hypertrophy. 1, heart cavity enlargement: a type of disease that causes the overall enlargement of the heart, including heart failure, dilated cardiomyopathy, myocarditis, heart valve closure insufficiency, hyperthyroidism and vitamin B1 deficiency. The above-mentioned diseases increase the volume load of the heart or heart ischemia, which leads to changes in myocardial metabolism, myocardial changes such as myocardial fibrosis, loss of the original contractile function, enlargement of the heart cavity, usually no thickening of the myocardium, common myocardial thinning. 2, myocardial hypertrophy: a class of diseases that lead to myocardial thickening, including hypertrophic cardiomyopathy, hypertensive heart disease, aortic stenosis, etc.. The above-mentioned diseases increase the pressure load on the heart compensatory caused by myocardial hypertrophy, when the myocardium thickens, the heart cavity becomes smaller, but the heart as a whole early can not change large. Whether the heart chamber is enlarged or myocardial hypertrophy, if the cause is not corrected, the development to the end stage will evolve into heart failure, heart enlargement is easy to develop into congestive heart failure, heart hypertrophy is easy to develop into diastolic heart failure, and eventually will lead to total heart failure. A large heart is caused by various diseases that change the structure of the heart, and the cause can be clarified through relevant tests. Heart failure can occur at the end of the development of a large heart, so if you have a large heart, you should seek medical attention in a timely manner to slow down the development of the disease.