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The feeling of the heart missing a beat or adding an extra beat is called palpitations. The heart might feel racing, pounding, or fluttering. Strenuous exercise, caffeine, stress, anxiety, panic, fear, dehydration, hormonal changes, low blood sugar, hyperthyroidism, fever, heart diseases, heart valve problems, blood loss, etc., can cause heart palpitations. Usually, palpitations are harmless, but if they are caused by heart problems like arrhythmias and valve problems, then immediate medical attention might be required. Palpitations accompanied by dizziness, weakness, lightheadedness, fainting, confusion, chest pain, excessive sweating, difficulty breathing, and raised pulse are symptoms of a serious underlying health condition. The tests used to know the cause of heart palpitations are stress test, Holter monitor, echocardiogram, electrocardiogram, chest x-ray, and angiography.