Can't rehab it without knowing what the real issue behind it is. You need an assessment go see a physio or exercise physiologist.
Some basic stuff to start with though.
Any accidents in your past happen to the wrist?
What kind of pain (sharp, dull, throbbing etc)?
Where is it exactly (in the joint, in the muscle around the joint)?
Does it hurt at other times (morning, night, sleeping)?
Do you do much repetitive hand movements at work?
Once those are done you can look into your lifting specifics.
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