Where your hand and wrist meet, you have a carpal tunnel. Beneath the skin where you can see the crease where that wrist-palm joint is, you have a band that almost looks like a subdurmal watch band. On some people, this band is naturally a little too tight, which can be problematic since all of the nerves that control you're finger movements are bundled up and run through this tunnel.

The pressure on this nerve bundle gets excacerbated when you do alot of movements or spend alot of time with the wrist either flexed or extended (typing on a keyboard with no wrist support, a waiter carrying a tray underneath with one hand).

You might just need an ergonomic keyboard to fix the problem, but alot of them are crap, you're doctor or ortho could prolly recommend a nice one. If not, a wrist cock-up splint that would keep the tunnel in the neutral position (less pressure on the tunnel which the nerves run through) should most likely do the trick. If it gets very bad over the years, they can go in and do a carpal tunnel release, where they just cut through the 'watch band' I mentioned earlier, and then I could spend six weeks with you afterwards cleaning the surgery site and making sure you get your range of motion back.