Hello there.... There are various causes of palpitations.... Common causes of heart palpitations include: Strong emotional responses, such as stress or anxiety, Strenuous exercise. Caffeine, Nicotine, Fever....Among these most common cause is Anxiety.... Reduce stress or anxiety. Try relaxation techniques, such as meditation, yoga, or deep breathing....Avoid stimulants. Stimulants, including caffeine, nicotine....Consult your Physician for further advice....