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An enlarged heart is medically known as cardiomegaly. Cardiomegaly can be caused by a number of different conditions, including diseases of the heart muscle or heart valves, high blood pressure, arrhythmias, and pulmonary hypertension. Cardiomegaly can also sometimes accompany longstanding anemia and thyroid diseases, among other conditions. Infiltrative diseases of the heart, for example, in which abnormal proteins (amyloidosis) or excess iron (hemochromatosis) accumulate within the tissues of the heart, can also cause an enlargement of the heart.
Some heart rhythm disorders can cause a fluttering in the chest, shortness of breath, chest pain or dizziness. Hyperthyroidism Hyperparathyroidism can cause fatigue and weakness, increased thirst, impaired thinking, and bone fractures. Atrial flutter. Atrial flutter is an abnormality of the heart's rhythm that causes rapid and sometimes irregular heartbeats. Aortic stenosis. Aortic stenosis is a condition of the heart causing shortness of breath, dizziness, or chest pain.