Based on the Yin and Yang life energy concept it is believed that the energy flows through meridians in the body. Pressure is applied to the acupuncture point with the aim of clearing the blockages in these meridians. The traditional Chinese medicine (TCM) theory for the selection of such points and their effectiveness is that they work by stimulating the meridian system to bring about relief by rebalancing yin, yang, and qi (also spelled “chi”).