Does it feel like it is kind of jammed up & a constant tension - like you need to rub, pull or twist your wrist often?
mine also felt like I had a tight watch on all the time.

for me it was muscle tension mainly originating up in the neck/pec area.

PT massaged & did ultrasound on my arms & wrist - it felt good but didn't make any difference long term, until I finally had a PT that looked higher up the chain.
They tx the neck & upper back and the forearm & wrist stuff finally resolved. I also learned about trigger points at about this same time frame.
So that probably helped also. tennis ball stuff.