Facts about Heart Fluttering Heart fluttering is a condition that most people have experienced at some time or another. It is the sensation of a heart beating too much swiftly or irregularly. Heart fluttering is usually called "palpitations," which are rapid, forceful, regular or irregular heartbeats that are quite noticeable to the individual. A rapid, regular heart fluttering may be associated with sensation of pounding in the neck as well, due to simultaneous contraction of the upper, priming chambers of the heart which is the atria and the lower, main pumping chambers called the ventricles. http://www.bthin.co.uk/healthyeating/facts_about_heart_fluttering.php