I have a rather odd problem that, very honestly, doesn't effect much in my life but is incredibly painful. I've had the problem for about five years, give or take. It only pops up a few times a week, but that's enough to be an annoyance. What happens is that I will lose all control of my hand, and the muscles "spasm" and contract and my thumb is drawn in toward the palm and the fingers are flexed and pulled out. It looks like I have cerebral palsy on one side, for lack of a better way to put it, and it's incredibly painful. It usually goes away after about twenty minutes, but until it does I'm unable to move or use my hand, it's very annoying. Does anyone know what causes this?