What is Heart Enlargement? An enlarged heart (Cardiomegaly) is a symptoms of some underlying health disorder or disease. Enlargement of the heart, or cardiomegaly, is not a disease, but required through medical examination in order to detect the cause behind it. Doctors usually preform a variety of tests to understand the reason behind your enlarged heart. Some conditions that can cause enlarged heart are STRESS, PREGNANCY, HIGH BLOOD PRESSURE, THYROID PROBLEMS, CORONARY HE... large size wears for formal party cost below 100