It's not fun, I can tell you that.
There's two kinds.
Carpal Tunnel is when the Median nerve in the wrist joint is compressed and it results in your palm, thumb, first finger, middle finger and half your ring finger going numb and feeling like a permanent pins and needles.
You also lose strength in the hand and fingers, try bending strings, etc.
The second kind is Cubital Tunnel Syndrome.
This is when the Ulnar nerve is compressed in the elbow area.
In this case (my case), the palm of the hand, the upper half of the ring finger and the baby finger are numb and weak.
Great fun doing legato with your baby finger but you can't feel your baby finger on the strings/fretboard.
Peter Hanmer had it on his right hand, his strumming hand, the only two fingers he could feel were his thumb and first finger, so he could hold the plectrum.
But, he couldn't mute properly because the rest of the hand, palm were numb.
After going to a bunch of expert specialists, one guy told him, "you're leaning on your elbow, you have to stop doing it".
Turns out when driving Peter was resting his right elbow on the door handle, that's what was causing his problem.
He stopped doing it, problem solved.
I notice when I'm sitting at my PC I lean my left elbow on the desk, perhaps this is my problem, who knows, we'll see, I'm not doing it any more.
Right now my unsuccessful guitar playing career is over, which is not a problem because it never started. ?
Anyway, lots to read about it on the internet, medication, surgery, etc, etc.
There's two kinds.
Carpal Tunnel is when the Median nerve in the wrist joint is compressed and it results in your palm, thumb, first finger, middle finger and half your ring finger going numb and feeling like a permanent pins and needles.
You also lose strength in the hand and fingers, try bending strings, etc.
The second kind is Cubital Tunnel Syndrome.
This is when the Ulnar nerve is compressed in the elbow area.
In this case (my case), the palm of the hand, the upper half of the ring finger and the baby finger are numb and weak.
Great fun doing legato with your baby finger but you can't feel your baby finger on the strings/fretboard.

Peter Hanmer had it on his right hand, his strumming hand, the only two fingers he could feel were his thumb and first finger, so he could hold the plectrum.
But, he couldn't mute properly because the rest of the hand, palm were numb.
After going to a bunch of expert specialists, one guy told him, "you're leaning on your elbow, you have to stop doing it".
Turns out when driving Peter was resting his right elbow on the door handle, that's what was causing his problem.
He stopped doing it, problem solved.
I notice when I'm sitting at my PC I lean my left elbow on the desk, perhaps this is my problem, who knows, we'll see, I'm not doing it any more.
Right now my unsuccessful guitar playing career is over, which is not a problem because it never started. ?
Anyway, lots to read about it on the internet, medication, surgery, etc, etc.