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Patients with cardiomyopathy, a stiffening and thickening of the heart muscle that weakens it, may develop an enlarged heart as it labors to pump an adequate supply of blood to the body. Coronary artery disease, in which plaque in the arteries interferes with the flow of blood, can cause the heart to enlarge.
Blood Pressure/Disease. Your heart can become enlarged due to high blood pressure. When you have high blood pressure, your heart has to work overtime to get blood circulating to your organs. If you develop diseases of your heart valves, your heart can enlarge. Diseases caused by congenital heart defects, infections, treatments for cancer and connective tissue disorders can also lead to an enlarged heart. When you have anemia, your red blood cells are unable to carry oxygen to your tissues.