Chi is the three letter term used to refer to vital life force in acupuncture. It is a Chinese concept that is believed to be the energy that flows through the body and is responsible for health and wellbeing. In traditional Chinese medicine, CHI is thought to be the source of all life and is seen as the bridge between the physical and spiritual realms. Acupuncture is a form of treatment that uses needles to stimulate specific points on the body in order to balance the flow of CHI and restore health.