So, I have pain in the pinky (ulnar) side of my wrist when I play tennis sometimes, and it lasts throughout the day after playing. I think it's tendonitis of the ECU or FCU. It doesn't hurt so much to pronate/supinate or to flex/extend, but moving side to side (abduction/adduction) hurts most. Tennis season is half over and I just want a temporary treatment that I can easily do without buying anything. I will take a few months off when the season ends. I just want it to stop for the time being so it doesn't get worse. Thanks.