Palpitation- a sensation that the heart is Racing, Fluttering, Pounding or skipping a beat. Most of the times, they are caused by stress and anxiety or because of too much intake of caffeine, nicotine or alcohol. Palpitations are common during pregnancy. Sometimes, Palpitations are due to underlying diseases. If Palpitations are accompanied by dizziness, fainting, shortness of breath or chest pain, one should seek medical attention.