It is not uncommon to feel the heart beat in some areas of body like neck, chest and abdomen. These are called palpitations. They are especially common on the left side of the neck due to a major artery
present caused to due pumping of blood to brain by heart. Common causes could be
4- Potassium imbalance
6-Heart disorder like arrhythmia
i.e. abnormal heart rate
Palpitations are usually not serious. however if they persist for longer period or occur frequently then an underlying cause could be the reason. If this condition persists then it is advisable to get an ECG done to rule out any underlying heart abnormalities.