Anyone else experience wrist pain when typing?

It's called RSI https://web.eecs.umich.edu/~cscott/rsi.html I also have it.

It is definitely due to your posture. Read up about it and try to maintain a comfortable posture.

tenosynovitis

I had a bad case of this when I removed the hand rest on my chair. It went away when I brought it back (and adjustrd to the right height)

I just started physical therapy for this. The number 1 thing that helps is a neutral wrist stance on keyboard. Start spending 5 mins a day on wrist and hand exercises. It is massively beneficial. 4 weeks ago, i couldnt type more than 5 mins. Now i can do an hour. The improvement is awesome.