I don t mean beating - I know what that feels like. I don t think it s palpitations either, although I could be wrong because I ve never had those before, I read a description online just now. It doesn t hurt, it s just like little jabs , underneath my left mammary gland , the jabbing moves slightly from side to side, softer sometimes, and then firmer other times. When I press against my chest , it feels like the regular heartbeat is a separate thudding against my hand from the other feeling. It s been going on for the past two hours or so, although I seem to be feeling it more now that I m paying attention to it. I asked my medical student buddy and he says a possible cause could be the intense academic stress I ve been under the past two days (but the stress is over now, I passed the test and my next one is the end of next week, plenty of time left to study). He says maybe it s an aftermath. I m just fishing for possible causes here- if I still feel this way in the morning (it s night now) I ll see a doctor . Twice in the past 4 years during compulsory medical tests I have had doctors tell me that my heart is making funny sounds (murmurs, I think they re called), but further examination revealed nothing out of the ordinary. They concluded that I might just have a funny shaped heart from birth and that it was nothing to worry about. Hmmmm..... maybe I should cut back on the McDees xD