An enlarged heart (cardiomegaly) isn't a disease, but rather a symptom of another condition.
The term "cardiomegaly" most commonly refers to an enlarged heart seen on a chest X-ray. Other tests are then needed to diagnose the condition causing your enlarged heart.
You may develop an enlarged heart temporarily because of a stress on your body, such as pregnancy, or because of a medical condition, such as the weakening of the heart muscle, coronary artery disease, heart valve problems or abnormal heart rhythms.
An enlarged heart may be treatable by correcting the cause. Treatment for an enlarged heart can include medications, medical procedures or surgery.