Hypnosis can certainly be used for pain control. Here is a link to a study done at the University of Washington School of Medicine:

Hypnosis And Clinical Pain

A good resource book is "How to Hypnotize Yourself Out of Pain Now" by Bruce Eimer, PhD.

Please note that hypnosis for pain control should not be used without getting checked out by a medical doctor first. Pain, although sometimes unreliable, can be a symptom of more serious issues. You would not want to be hypnotizing yourself out of a headache if it were a symptom of a brain tumor, for example. Secondly, for most people, going into a hypnotic trance is a learned response that takes practice, so let yourself enjoy practicing going into a hypnotic trance.

Greg Turner, CCHt.
Certified Clinical Hypnotherapist
Pain Management & Accelerated Healing