What are you playing and how's the action set up. Are you fighting with your lessons and being tense. Review your lessons on proper posture. It's somewhere in Fundamentals 1.
Try doing some hot water soaking and ringing out a wash cloth several time. I twist the rolled up cloth several time in each direction. Also let your arms hang down at your side and shake them loose. This seems to help me, I hope it helps you. I usually have pain from not playing and it's in the thumb joint.
At my age, I get pains all over and it helps if I stay active.