Cupping is a therapy in which a jar is attached to the skin surface to draw up waste through negative pressure suction, created by introducing heat of an ignited material, or by use of a small pump on a plastic cup.
Glass cups are most commonly used in North America, but bamboo or plastic cups are also available. The cup can then either be left stationary or moved with the assistance of oil. Sometimes cups are placed over needles to increase stimulation. The purpose is to release tissues, relax muscles, warm and promote the free flow of Qi and Blood, dispel Cold and Dampness (TCM terms), and reduce swelling and pain. This therapy has been effectively used in many parts of the word for centuries.