This year, I have changed my grip. After my round Saturday, I noticed that my left wrist was extremely sore. I put ice on it and it swelled up even more, but seemed to be better two days later. You could have strained some of the muscles in your hand and wrist by repeating the same motions too many times. This kind of minor muscle pull results from overstretching or overusing the area.
Symptoms are soreness in the muscle, but no loss of muscle strength.
Treatment is to apply ice or cold packs for at least the first 24 hours after the injury. You should try not to use the injured area while it's still painful, which usually is for a few days. The other possibility is that your new grip caused the bursa in your wrist joint to swell. As with muscle strains, asking a joint to perform the same motion over and over again can cause irritation and swelling of the bursa. When one or more of these sacs swell, it's called bursitis.