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MarkSSC said..
The description of a pain line from your fingers to your could suggest that the cause may be the nerve that runs down your neck all the way down your arm. The pain is usually felt in the region of the elbow, a la tendonitis. A simple exercise known as a radial glide can fix it. There are a few variations of it online, the ones I used came from my Physio. The movement frees up the nerve pathway. Very effective.
Interesting. I've had elbow tendonitis before that flex bar exercises fixed very quickly, but I also sometimes have tingling fingers while windsurfing, and (light) pain at other places in the lower arm afterwards. Looking at the first picture at
overhaultraining.com/radial-nerve-entrapment/ and reading about it, it seems quite possible that there's some radial nerve entrapment going on. Will have to try some radial glide exercises and supinator/pronator strengthening exercises. It seems, though, that the flex bar exercises also would induce a bit of nerve gliding - maybe just not enough, or not at all the right places.