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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.
Causes of heart palpitations. Heart palpitations are frequently caused by stress or anxiety. In addition to making you feel terrible emotionally, stress can have a physical effect on your body. As a result, stress can cause the nerve endings that control your heart to fire more frequently or irregularly. Anxiety and panic attacks can also trigger palpitations by elevating adrenaline levels. Food and drink can cause heart palpitations. Caffeine, nicotine, and alcohol can all affect your heart rate and may also increase the likelihood of irregular heartbeats. Some medications can cause heart palpitations. These include asthma inhalers, over the counter medications such as pseudoephedrine, and thyroid medications.