Never had my arm hurt from playing on a comp...but I've had it go entirely numb from sitting in the same position playing Metal Gear Snake Eater for oh god, I think more than 12 hours straight. I love that game.
Yeah, it was going numb every few mins when I tried to shake it off and continue playing. I had to actually get up from my bed and go do something else for awhile lol. Crazy.
I've had my finger bones(the finger bones in my hand above m knuckles, not in the finger digits...)get pretty damn sore after playing an a WASD + CTRL/Shift game for too long though...your hands just aren't made to do those movements for such a prolonged period of time.
Mayb you're having heart problems.

Having chest pains and/or shoulder and/or jaw pains along with your arm pain?
