Sarno is the guy. It worked for me.
The basic idea is that you're too stressed out and your body causes a ton of inflammation in your back, neck, wrists, whatever. The book kinda stinks, and I didn't believe it, but after a week my pain went away. All it took for me was a couple of days saying to myself, "You're stressed out because your dad's dying and your girlfriend moved away and your boss is an asshole." You don't have to fix everything in your life, just admitting shit is fucked up makes it better.