Be still, my beating heart

Palpitations, which are defined as an awareness of an abnormal heartbeat, can feel as though the heart is skipping, flip-flopping, or racing. These heart “hiccups” are usually harmless, such as those that result from a small surge of adrenalin that causes the heart to beat faster or more forcefully than usual. But some unusual heart rhythms warrant closer attention, especially if they occur in tandem with symptoms such as feeling lightheaded, dizzy, or faint.