I started playing bass and guitar this year, so I could have a hobby outside of skateboarding. Now I'm showing symptoms of carpal tunnel and tendonitis.
Now neither hobby is enjoyable without the hassle of constantly worrying about injuries.
I play bass too. I started in 91 I think.
It could be the new muscle development.
Is there numbness or shooting pains or is it like a centralized pain like a shinner?
I would maybe try a different bass too.
It could be the neck shape. The finish on the neck even.
What have you got for a bass?
I think wine crab plays bass too. Bass is the best instrument to learn on I think.
If it is muscle pain you can down tune so you have looser strings that will make it easier to push down between frets.
I'm trying to be self taught at piano now. That's pain. More pain than relearning drums.