I really only have one symptom and it doesn't bother me much (well, I've gotten used to it), but I am a little concerned. To be honest, it's been with me for 6 or 7 years now... it's been a while since my last physical. I have continuous (as in, 24/7/365) heart palpitations. My blood pressure is generally normal to slightly low (120/75, usually), and my resting heart rate is about 55-60 bpm. I'm otherwise healthy, male, 23 years old, active, 6', 165 lbs. The palpitations are always there but vary in degree (mostly depending on my degree of relaxation). They can be pretty intense... to the point where you can see the left side of my chest beating. What might this be? (Yes, I realize I should see my GP, but I have an intense fear of doctors/bad news/surgery. I'd like to have some idea of what I might have). I should note that I have mild anxiety (not officially diagnosed), and that I don't take any medications.