I had hand pain years ago caused by mousing and pressing the tab key a lot (was doing mega data entry) and after a disastrous relationship with voltarol gel (caused kidney failure which required 2 years of steroids which saw me end up at 123kg), two sessions with an osteopath who unscrewed my head fixed the problem - presumably some kind of nerve trappage. I am tall for a woman so hunch over a bit.
Anyway, I also got a graphics tablet and it’s really good for a lot of things but it’s not good for data entry, for example, as you have to keep putting it down in order to type, then pick it up again to move to another field. Or stick the pen in your mouth, which is not ideal.
I use my mouse 95% of the time and use the graphics tablet when I am doing actual graphics. I also go to the osteopath once every three years for a neck-unscrewing-top-up.