Each acupuncture point has a specific action on the body when it is stimulated by acupuncture or acupressure. Acupuncture points lie along the course of specific channels called meridians along which Qi, or energy, flows. Meridians run throughout your entire body and are interconnected, forming an intricate network that enables Qi to flow smoothly. Acupuncture points can exert specific effects along the entire course of the meridian.
For example, the Large Intestine meridian flows from the tip of the index finger along the arm to the shoulder, along the side of your neck to your face. An acupuncture point that lies on this meridian exists on the back of your hand which is often used to treat headache, because the course of its meridian reaches the head.