Pain; Reality or Imagination?

                                                                              When you injure yourself, is the pain we feel purely                                                                                a mental reaction or physical?

The injury itself is physical of course, along with the nerves and receptors, but is it possible the feeling of pain is something our brain comes up with? Anaesthesia allows your brain to be shut down however your body still works. So when a surgery is carried out under anaesthesia, the patients body gets injured but they don't feel pain/recognize this injury as “pain” which suggests that it comes solely from our brains, which suggests it is not         “real”. Does anyone else have any thoughts?