Acupuncture is an alternative medicine methodology originating in ancient China that treats patients by manipulating thin, solid needles that have been inserted into acupuncture points in the skin. According to Traditional Chinese medicine, stimulating these points can correct imbalances in the flow of qi through channels known as meridians.
Current scientific research indicates that traditional forms of acupuncture are more effective than placebos in the relief of certain types of pain and post-operative nausea. Other reviews have concluded that positive results reported for acupuncture are too small to be of clinical relevance and may be the result of inadequate experimental blinding. The invasiveness of acupuncture makes it difficult to design an experiment that adequately controls for placebo effects.
Acupuncture's use for certain conditions has been endorsed by the United States National Institutes of Health, the National Health Service of the United Kingdom, the World Health Organization and the National Center for Complementary and Alternative Medicine. Some scientists have criticized these endorsements as being unduly credulous and not including objections to or criticisms of the research used to support acupuncture's effectiveness. There is general agreement that acupuncture is safe when administered by well-trained practitioners using sterile needles and carries a very low risk of serious adverse effects.