Dunno what this could be but when I stand up sometimes and or when I get like anxious in a way. I can feel my heart pump extremly heard but slow in my chest it only lasts a few seconds but is very discomferting. Anyone know what this could be? To my knowledge I dont have nay heart problems Ive had an EKG here recently it came up okay. I do have the what ive come to think as the more common arrythmia. Iam 22 years old maybe 10 pds overweight but not to active. Any help would be appreciated!