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Acupuncture
Acupuncture is a technique of inserting and manipulating needles into "acupuncture points" on the body. According to acupunctural teachings this will restore health and well-being, and is particularly good at treating pain. The definition and characterization of these points is standardized by the World Health Organization. Acupuncture is thought to have originated in China and is most commonly associated with Traditional Chinese medicine (TCM). Other types of acupuncture (Japanese, Korean, and classical Chinese acupuncture) are practiced and taught throughout the world.
 Acupuncture chart from Hua Shou (1340s, China Ming dynasty)
Chinese medicine is based on a different paradigm than scientific biomedicine. Its theory holds the following explanation of acupuncture:
Acupuncture treats the human body as a whole that involves several "systems of function" that are in some cases loosely associated with (but not identified on a one-to-one basis with) physical organs. Some systems of function, such as the "triple heater" (San Jiao, also called the "triple burner") have no corresponding physical organ. Disease is understood as a loss of homeostasis among the several systems of function, and treatment of disease is attempted by modifying the activity of one or more systems of function through the activity of needles, pressure, heat, etc. on sensitive parts of the body of small volume traditionally called "acupuncture points" in English, or "xue" (cavities) in Chinese. This is referred to as treating "patterns of disharmony".
Treatment of acupuncture points may be performed along the twelve main or eight extra meridians, located throughout the body, or on tender points, called "ashi" (signifying "that's it", "ouch", or "oh yes"). Of the eight extra meridians, only two have acupuncture points of their own. The other six meridians are "activated" by using a master and couple point technique which involves needling the acupuncture points located on the twelve main meridians that correspond to the particular extra meridian. Ten of the main meridians are named after organs of the body (Heart, Liver, etc.), and the other two are named after so called body functions (Heart Protector or Pericardium, and San Jiao). The meridians are capitalized to avoid confusion with a physical organ (for example, we write the "Heart meridian" as opposed to the "heart meridian"). The two most important of the eight "extra" meridians are situated on the midline of the anterior and posterior aspects of the trunk and head. The twelve primary meridians run vertically, bilaterally, and symmetrically and every channel corresponds to and connects internally with one of the twelve Zang Fu ("organs"). This means that there are six yin and six yang channels. There are three yin and three yang channels on each arm, and three yin and three yang on each leg.
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