Reflexology is a system of massage used to relieve tension and treat illness, based on the theory that there are reflex points on the feet, hands, and head linked to every part of the body. Traditional Chinese Medicine (TCM) used the concept of qi flowing through the channels to explain this. Another way of looking at it is the connection between the central nervous system, composed of the brain and spinal cord, and the peripheral nervous system, which includes all of the rest of the nerves on the body (there are over 7,000 in the foot alone).