Heart palpitation is the severe and rapid heart beating condition. It mostly arise during the hard physical activity, exercise, excitement, stress or fear. Mostly person feels fast heart beat in chest, throat, and neck. This situation usually ends with a certain time period. But if it comes on and off with chest pain, shortness of breath and dizziness than it may be due to some medical condition like thyroid disorder, low blood pressure, hormonal imbalance or anemia. Visit the doctor to diagnose the problem of palpitation. Mostly simple life style changes and medication efficiently work to control the heartbeat.