Carpal tunnel does cause numbness. In my experience, it caused other symptoms too. I actually had tingling and pins and needles before the numbness. And the numbness seemed to affect some of my fingers more than the others.
I think that rest is the best way to treat carpal tunnel. In severe cases doctors do surgery to treat it. I would have definitely considered it if numbness and pain had continued or worsened. But resting, wearing a splint and hot and cold therapy helped relieve my symptoms. It took some time though and there were days when I had to take a pain reliever. I also used a topical anti-inflammatory cream which helped a lot.