back arthritis

My father had X-rays taken on his back. Turns out he has arthritis in his back.

I’ve only ever heard of arthritis in hands or knees, never in the back.

He got some aniti inflamitory meds from his doc but is still in plenty of discomfort.

Anyone know of what he can do to get some relief?
How should he care for his back from now on? exercise or not?
Does a change in diet help?
Heat or ice?

You can have arthritis anywhere you have joints. I recommend visiting one of the medical help websites, such as
http://www.medhelp.org/