I recently watched an episode of house (medical TV show) in which house used the (probably) well known mirror box method to relieve pain in the phantom limb of an amputee.
That just reinforces the possibility that pain may be more of a psychosomatic symptom than we think.
"One particularly novel treatment for phantom limb pain is the mirror box developed by Vilayanur Ramachandran and colleagues (Ramachandran, Rogers-Ramachandran & Cobb 1995). Through the use of artificial visual feedback it becomes possible for the patient to "move" the phantom limb, and to unclench it from potentially painful positions. Repeated training in some subjects has led to long-term improvement, and in one exceptional case, even to the complete elimination of the phantom limb between the hand and the shoulder (so that the phantom hand was dangling from the shoulder)."
This is from Wikipedia article for phantom limb http://en.wikipedia.org/wiki/Phantom_limb
"One particularly novel treatment for phantom limb pain is the mirror box developed by Vilayanur Ramachandran and colleagues (Ramachandran, Rogers-Ramachandran & Cobb 1995). Through the use of artificial visual feedback it becomes possible for the patient to "move" the phantom limb, and to unclench it from potentially painful positions. Repeated training in some subjects has led to long-term improvement, and in one exceptional case, even to the complete elimination of the phantom limb between the hand and the shoulder (so that the phantom hand was dangling from the shoulder)."