Acupuncture is a technique of inserting and manipulating fine filiform needles into specific points on the body with the aim of relieving pain and for therapeutic purposes. According to Traditional Chinese medicine and acupuncture theory, these acupuncture points lie along meridians along which qi, the vital energy, flows. There is no physically verifiable anatomical or histological basis for the existence of acupuncture points or meridians. Modern acupuncturists tend to view them in functional rather than structural terms. Acupuncture originated in China and is most commonly associated with traditional Chinese medicine (TCM). Different types of acupuncture (Classical Chinese, Japanese, Tibetan, Vietnamese and Korean acupuncture) are practiced and taught throughout the world.