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How to treat an enlarged heart 
Recognize the causes. 
There are many diseases that can cause an enlarged heart. These include heart valve or heart muscle disease, arrhythmia, weakening of the heart muscle, fluid around your heart, high blood pressure, and pulmonary hypertension.
You can also develop an enlarged heart after thyroid disease or chronic anemia. It can also be due to a build up of excess iron or abnormal proteins in your heart.