I didn’t suggest that the OP was brushing off RSI. I was talking about the somewhat dismissive tone of the poster I was directly responding to. It would be a shame for someone to read such a post and think, “Oh, RSI is an umbrella label for many things. Nobody knows just what my problem is. I’d better just tough through it.” Or similar. Umbrella label or no, RSI is serious business, and can severely impact people’s lives/careers.

I agree with you that features discussed in the OP like being too cold or having emotional stress in your life could contribute to the problem.