sore thumb joint makes for painful riding

[flynrider]

I had a thumb issue last year, which turned out to be a strained/bruised tendon. I think it was from some overenthusiastic wrenching. Doc said to keep from making movements that aggravate it, and it would eventually take care of itself. Fortunately for me, it was on my left thumb. The most pain was when I used my thumb to activate/cancel the turn signals, so I just modified the hand movement so I wouldn't have to stretch the thumb so far. It took almost a year to completely go away.

Since yours is on your throttle hand, I think one of those cramp busters (where you use the palm of your hand) would probably work best. It'll keep you from having to wrap your thumb all the way around the throttle.

Good luck!