Disclaimer that I'm not a medical expert though fairly well informed: For better or for worse, I get a lot of palpitations and cardiac weirdities, definitely associated with work. Had nearly an hour last night where I was getting a PVC ("skipping a beat") nearly every three beats after another 14h day and far too much caffeine. [Un]fortunately, the cardiologist says PVCs are actually very common and only very rarely more dangerous, so while the really big ones can be distressing, I don't cast too much hope etc on them. Possibly more likely, overwork and stress will wear down the immune system to compromise us in other ways though?