Palpitation is the awareness of your heart beating and may suggest that there is an underlying heart rhythm disturbance.

The sensation is sometimes described as a fluttering in the chest, butterflies in the stomach or pounding in the chest.  It can last from just a few seconds to days at a time, either continuously or intermittently.  If these episodes are troublesome it is often good to try and get an ECG done to record the heart rhythm during a bout of palpitations.  In some cases palpitations are not caused by an abnormal heart rhythm and are just an awareness of your normal heart beat.