|Jamie A. Decker, MD|
Palpitations are the sensation that your heart is beating fast. Your heart beats are generated by your heart's own intrinsic cells as well as by your nervous system and adrenaline that is produced by your body. So when your nervous system is activated or there is a release of adrenaline in your body, your heart starts beating fast. This is why you feel your heart beating faster when you exercise, get scared, or become anxious. Sometimes, the heart may be very sensitive to adrenaline and nervous system inputs and you feel like your heart is beating faster than it should. However, your heart is just doing what it is being told to do and there is nothing wrong with your heart. These feelings may occur if you are dehydrated or do not drink enough fluids throughout the day. Stress and anxiety may also create this sensation. Certain medications and excessive caffeine may also result in normal fast heart beats. Metabolic problems, such as an overactive thyroid can also cause these kinds of heart beats.