I noticed today while swimming laps that the sensation goes away completely, but is back now. My orthopedic guy told me it could be carpal tunnel syndrome, or it could be some other inflammatory situation that a cortisone shot might help. He referred me to the neurologist so I see him on Tues.
I did have a muscle or tendon pull/tear last month in my left wrist that was swelling after each round (of course I didn't rest it). It seems to be healed now, but might be a contributing factor.