Hi all, I'm wondering if any of you have any ideas on an issue I've been having. When my arms are getting worked out (in this case, on a rowing machine), I sometimes - maybe once every 30 min workout - get an odd shooting pain stemming from my wrist, and travelling slightly up my arm. This happens when I'm pulling the rowing handle towards me. It's not like a normal muscle pain or ache where you can push through it, because it's just so random in its occurrence. Also, the pain is - I wouldn't go as far as to say frightening - but it's a really unnerving feeling that makes me want to stop immediately. Incidentally, I had this problem when I was doing some summer work back last year. I was in a factory packing 25kg bags onto pallets, and I'd sometimes get in then, too - in exactly the same place, and exactly the same feeling. It sort of switches between my arms, but it often happens in my left arm (my weaker one). Yet, it doesn't seem affected by the weight of what is being lifted or whether my muscles are cold or in the middle of a workout; sometimes it just twinges when I pick up something like a carrier bag of items from a supermarket. I can't explain it; it's more akin to an electric shock than muscle pain. And, it doesn't instigate the same reaction as a random pain. I don't feel "ouch" when it happens, it's more like "argh, what the fuck is that?!" and it makes me want to rub my arm, like an electric shock. Does anyone have any ideas what could be the source of this pain, and/or what I could do to mitigate it?