are you playing with the right posture? you should always play sitting up in the chair you are playing in or just stand up while playing. i used to practice in a chair and lean back in it, almost totaly horizontal, it was comfortable for a month or so then my wrist started bothering me. i started sitting up and the pain went away after about a week. it was hard to get back in the habbit of sitting up though. i just started playing standing up.