A heart palpitation (sounds like pal-pih-tay-shun) is when your heart feels like it is pounding, racing, or fluttering. You might feel like your heart has skipped a beat or added an extra beat. You might feel overly aware of your heartbeat. These feelings or sensation can sometimes be felt in your chest, neck, or throat. While you are having palpitations, your heart rhythm may or may not be abnormal.