Palpitations are the sensation of a rapidly or irregularly beating heart.
Palpitations can occur normally when your heart is working hard. For example, you might feel a rapid or irregular heartbeat when you have just exercised, have a fever, or are feeling anxious. At these times your heart may pump faster or increase the amount of blood it pumps with each beat. This is a normal response to lifting weights, walking up a hill, or becoming emotionally excited. Often you may not even notice this increased heart activity.