I had carpal tunnel syndrome after the birth of my 2nd child. I got custom-made rigid plastic splints, wore them every night to give my thumbs / wrists a rest and chance to heal, and the condition cleared up in a couple of months. That was 40 years ago--long before I got cancer. My mother had trigger finger--not cancer related--she just lived with it. My sister had severe carpal tunnel, (no cancer) and was successfully treated by surgery.
My guess that some people are just prone to these hand / wrist conditions and AIs may make them worse. However, before stopping AIs, see if you can get rigid custom splints that immobilize the thumb and wrist (not the kind that let the thumb move freely). They really helped me.