What does a heart flutter feel like?

Heart arrhythmia: Most people experience heart arrhythmias as a heartbeat racing, or feel like it keeps skipping beats or a hiccup. Others describe them as throbbing, flip-flopping, murmuring, or pounding. Others just describe a wave of dizziness or dread. Causes can be as varied as stress, anxiety, or panic, dehydration, low potassium, low blood sugar, too much caffeine. See a Dr if you feel them more than once.