[Kodos]

I originally thought it was from holding my phone in my left hand, so I got a belt to carry the phone in. But that didn't stop it. I don't think I tense the arm or hand up, but I do make a conscious effort to have the hand open/relaxed, rather than clenched in a fist. I end up trying to elevate the arm over my head to try to revive it, but it's not really effective. It feels best when I let it hang like a limp sausage.

I've had those secret thoughts that this must be a heart attack warning, but I realize that's pretty silly. My hypochondriac theory goes more along the lines of "blood clot waiting to shoot into my heart" thoughts.