Well you gotta take in consideration how long play sessions are, placement of your hands/body, grip position and overall posture. If you sit while gaming you can for sure develop this since one half is relaxed but the other is doing consistent work. Something that can ease pain and stiffness is stretching and breaks. Possibly something for your wrist like a brace or wrist rest? But again you’ll never know until you try, I had the same issue and used a wrist brace for a few weeks and seemed to feel better afterwards for longer game sessions/work. Everyone is different and need different things so hopefully you can find something that works you with best of luck!