To better understand it put it in a search on Youtube .
I haven't used it for ages, but I used to use it to reduce the pain of arthritis.
Such as the painful part being a fire and piling ice cubes on the fire to cool it down. It is visualization.
Like a meditation, it can and does work, if you just take the time to do it.
Pain is the most common symptom of joint disorders. The history should address the character, location, severity, factors that aggravate or relieve pain.