I Think this is the Dequervains tenosynovitis syndrome. My muscles side to the wrist, are paining and the muscles straight to the arm near the elbow and up the right arm. There is pain when i play badminton for like 4-5 hours a session, but that is not happening nowadays. The pain started when i started using the squeeze ball(http://www.ebay.in/itm/BODY-SCULPTU...7?pt=LH_DefaultDomain_203&hash=item4165d705bf). I grip the ball completely with my fingers and squeeze the ball with 5 fingers at same time. Is the pain because, the ball cannot be used or my way of using it is wrong? How can i prevent this????