It seems very important for back pain treatment. A new research has been published in megazine Newscientist,which is talking about this.

The researchers who made the discovery scanned the spinal cords of volunteers while applying painful heat to one arm. Then they rubbed a cream onto the arm and told the volunteers that it contained a painkiller – but in fact it had no active ingredient. Even so, the cream made spinal-cord neural activity linked to pain vanish.

So,The placebo effect is not only real; its ability to deaden pain has been pinpointed to cells in the spinal cord. That raises hopes for new ways of treating conditions such as chronic pain.

Powerful placebo,I think it may be why many "famous therapists" always have better results,as patients belive that they are doing right job.

Oh,my dear.