A vertical mouse saved me from carpal tunnel syndrome. A few years ago I started developing wrist and elbow pain in my mouse arm along with the numbness. It was getting so bad I would take frequent breaks to ice my wrist and would wear a brace at night. I started looking for ergonomic mice and decided to try out a $15 Anker one from Amazon. I felt relief the day I started using it and within a few days the symptoms were gone entirely.