I changed a number of years ago, because my right wrist and elbow hurt all the time. I use a trackball with the ball on top. Key thing I had to do was switch

I changed a number of years ago, because my right wrist and elbow hurt all the time. I use a trackball with the ball on top. Key thing I had to do was switch the buttons. At work I still keep a conventional mouse (right side, buttons normal), for when others want to show me something on my computer.