Unlike a physical injury which is obvious to the naked eye; pain cannot be identified nor can it be measured. Indeed, neurological pain can be agonizing and yet have no ‘apparent’ cause

The key components of pain are sensory, cognitive, physiological, behavioural and emotional. Consequently, each person’s experience of pain is highly subjective and is not only felt but can also be constructed in much the same way as memory.  This can happen when pain is present for a lengthy period of time. It  can become  ‘programmed' like a form of physical memory. This being so, pain really can become an habit and so can (and frequently does) return to reek havoc in the future.