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You can try changing handlebar positions but mostly it's bad nerves due to having too much fun when you were a young whelp.
Surprising no-one's said, sounds same as me, whitefinger or Raynaud's, common as muck, vibration and cold both agitate ittrying a powder, dissolved in water, will post when I remember what it is, has shown promisehttps://en.wikipedia.org/wiki/Raynaud_syndrome
I've had hand numbness for years. Had the test, reaction in the nerves was 60% delayed. Had the Carpel Tunnel Relief surgery......hand is GREAT!Big problem is when you sleep many curl their wrists inward, like how a cat sleeps. This is bad on the "tunnel". At CVS drug stores they sell a wrist support by Futuro #482571 for $30.00 that's padded and prevents you from "curling" your wrist at night. They work! While waiting my surgery I was wearing on both hands nightly and had zero pain riding 5 hours to a rally and 5 hours back.... My right hand needed the surgery so I still did it. After the surgery on the right hand I quit wearing them and the left hand would still go numb on the bike if I had not been wearing it. I now wear them both nightly, just because.
Big problem is when you sleep many curl their wrists inward, like how a cat sleeps. This is bad on the "tunnel". At CVS drug stores they sell a wrist support by Futuro #482571 for $30.00 that's padded and prevents you from "curling" your wrist at night. They work!
not expensive and it WORKS!
This might sound a bit simplistic but bear with me...do you wear a wristwatch on that arm? If I wear a watch the constriction will cause my left hand to go numb just as you describe. I think the pressure of the watchband combined with the glove is just enough to cause the problem. No watch, no problem!