I had a time when I had tendinitis so bad I thought I'd have to quit typing but then I started doing pushups and the problem cleared up in two weeks.
There definitely are epidemics of people thinking they have a disease as apart from an actual disease, although those kind of RSI problems often have a mind-body connection so how you feel about your work is just as important as the physical aspect.
I had about 20 years of ill-defined pain affecting my upper back, shoulders, neck, etc. My dentist told me a few times I was grinding my teeth and I ought to get a guard, I tried that and the pain very quickly focalized in my jaw and I realized it had probably been TMJ all along. After about 2 years of wearing a bite guard and a few months of a soft diet it has gotten a lot better. Once in a while I have a bad day but mostly I forget I have TMJ although I could get mad at myself and my docs for 20 years of pain I could have avoided.
A good office chair also helps, along with working out.
I question whether they ever got the diagnosis right in the first place--my experience with what bothers me is *not* a matter of repetitive motions at all, but having to support my hands out horizontally for hours. It's just nobody does the latter without also engaging in repetitive motions with said hands. Trackball instead of mouse and a wrist rest so I can use the computer while my wrists are on solid surfaces and I've had absolutely zero issues since. Just as much motion, but not the ongoing muscle tension.
Unlike many other health related problems this could be easily addressed within one trip to the computer store.
I’ve never had the slightest bit of issue even though I’ve been using a computer daily for 8+ hours every day for 30 years.
Home row typing is bad for your wrists.