first of all - i don't really no what i'm on about so if this makes it worse it ain't my fault :wink:
i used to get a sharp, achey, throbbing pain in my wrists and sometimes inside my elbows. basically it went away when i started to stretch them out properly. for the wrist stretch - put your hands together as if u were praying and bring them into your chest. now turn it upside down, keeping the prayer position, and push your palms together while pushing your elbows down. if this really hurts then u probably shudn't do it.