Since I was about 17 I have experience fluttering sensations in my chest (usually right between breasts under breastbone). I have had an echo done, EKG, holter monitor,
stress test, and blood work done. My doctor says she is not concerned that it is a cardiac problem. However, some days recently I have experience a "flutter" every 5 minutes! Usually accompanied with these flutters I burp alot, have heart burn, and have acid regurgitation in my throat.