he taught me this trick, which i think will be useful for not just painters but also people who crochet and writers and jewelers and anyone who works with their hands. i'm not a doctor obviously so this isn't medical advice or a replacement for it, but it's a little tip to reduce your likelihood for injury and possibly provide some relief from some existing work-related pain. (if you're in serious pain, you should see a doctor immediately)
ok! so here goes. you'll need:
1. your narrow instruments (paintbrushes, pencils, pens, knitting needles, anything with a pretty narrow diameter in the handle)
2. some tennis overgrip tape (you can get it at any sports store)
and that's it! it'll take a minute of your time and could save you from a lot of needless suffering. hope this is helpful to someone else out there!