As a professional photographer, avid Youtuber, and author, I'm on the computer a LOT!
A few years ago I started to get a lot of pain in my right wrist (I'm right handed) from using a mouse all the time. Not using the computer wasn't an option, so I started looking around for a solution.
The first thing I tried was a trackball mouse like this one.
It helped for a while, but it wasn't too long before the wrist pain returned, so I looked into other possible solutions. That's when I came across the Wacom Graphics Tablets, or Pen Tablets as they're commonly referred to.
Several of my photographer friends were using them, and not only were solving wrist pain problems, it turns out that once you get used to them (they do take a short period of time to adjust to as they're quite different than a mouse), pen tablets are MUCH better for tasking like photo editing, drawing, illustrating, and other detailed work such as photographers, artists, illustrators, and others do.
I started out with an earlier version of this one, the Wacom Intuos4 Small (about 4"x6"). It's a smaller pen tablet, but it worked great! My wrist pain disappeared, and I was really impressed with how much better the pen tablet was for photo editing.
As is usually the case, it wasn't long before I was interested in an up-grade. :-) Call it the pitfalls of being a gadget nerd. :-)
The next tablet I bought was an earlier version of this one, the Wacom Intous4 Medium Graphics Tablet (about 6x8). I still have mine several years later, and it still works great! Even better, I haven't had any wrist pain for years!!!
In fact, I love my pen tablet so much, I added another small one for my laptop about a year ago. I bought the Wacom Bamboo Graphics Tablet to use on my laptop as it was small and portable, and VERY reasonably priced!
As an added bonus, I find myself using my laptop more often now that I have a pen tablet for it too! This allows me more portability and flexibility on where I do my work, which is why I originally bought the laptop.
If you're having wrist pain from using a mouse, I wholeheartedly encourage you to try a pen tablet. It solved my wrist pain problems, and I actually found I MUCH prefer a pen tablet to a mouse for sheer ease of use.
Pen Tablets are just TOO Cool!