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Is it both sides or the right side only? I'm assuming you are right handed.
The first thing I would suspect is a pinched nerve caused by uneven muscular stress (all on one side). I used to have that problem then finally figured out how to make it stop. I moved the monitor, keyboard and mouse way back on the desk so that both forearms were resting completely on the desk (up to my elbow). That meant that I wasn't "holding up" my right arm while my left arm was relaxed. 12 - 15 hours a day of that over 10 years will definitely lead to some back stress.
As far as what to do when it happens, there's no magic bullet that hasn't already been suggested. The best thing is to try to prevent it by relaxing and balancing any exertion on your back equally on both sides. Another thing that helps a lot is to do shoulder rolls throught the day - they melt away stress. Just rotate your shoulders up, out, down and back in a continuous circle.
I've had these types of problems on and off for years and hope you find some of this helpful.
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