Well, if we do agree placebo response (what I meant by 'psychological conditioning' of course) is a likely mechanism of healing, then that is some common ground. I have read there is evidence from clinical trials to support the physiological efficacy of placebo in treating patients with Parkinsons disease for instance.

It's the something more I'm sceptical of. The woo-woo (or ju-ju). I choose evidence-based medicine.

Provided healers only ever offer their services as complimentary to orthodox medicine, then I don't take issue. This is not always the case as far as I'm aware. Already on this thread there has been some anti-science rhetoric, not clever.