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The Science Behind
   Acupuncture
NIH & WHO

Recognition of Oriental Medicine and Traditional Chinese Medicine

From the National Institute of Health (NIH)

Introduction

Acupuncture is one of the oldest, most commonly used medical procedures in the world. Originating in China more than 2,000 years ago, acupuncture began to become better known in the United States in 1971, when New York Times reporter James Reston wrote about how doctors in China used needles to ease his abdominal pain after surgery. Research shows that acupuncture is beneficial in treating a variety of health conditions.

In the past two decades, acupuncture has grown in popularity in the United States. A Harvard University study published in 1998 estimated that Americans made more than five million visits per year to acupuncture practitioners. The report from a Consensus Development Conference on Acupuncture held at the National Institutes of Health (NIH) in 1997 stated that acupuncture is being "widely" practiced—by thousands of physicians, dentists, acupuncturists, and other practitioners—for relief or prevention of pain and for various other health conditions.

NIH has funded a variety of research projects on acupuncture. These grants have been awarded by the National Center for Complementary and Alternative Medicine (NCCAM), the Office of Alternative Medicine (OAM, NCCAM's predecessor), and other NIH Institutes and Centers.

This fact sheet provides general information about acupuncture, research summaries, a glossary that defines terms underlined in the text, and a resource section.

Acupuncture Theories

Traditional Chinese medicine theorizes that there are more than 2,000 acupuncture points on the human body, and that these connect with 12 main and 8 secondary pathways called meridians. Chinese medicine practitioners believe these meridians conduct energy, or qi (pronounced "chee"), throughout the body.

Qi is believed to regulate spiritual, emotional, mental, and physical balance and to be influenced by the opposing forces of yin and yang. According to traditional Chinese medicine, when yin and yang are balanced, they work together with the natural flow of qi to help the body achieve and maintain health. Acupuncture is believed to balance yin and yang, keep the normal flow of energy unblocked, and maintain or restore health to the body and mind.

Traditional Chinese medicine practices (including acupuncture, herbs, diet, massage, and meditative physical exercise) all are intended to improve the flow of qi.

Western scientists have found meridians hard to identify because meridians do not directly correspond to nerve or blood circulation pathways. Some researchers believe that meridians are located throughout the body's connective tissue; others do not believe that qi exists at all. Such differences of opinion have made acupuncture an area of scientific controversy.

Mechanisms of Action

Several processes have been proposed to explain acupuncture's effects, primarily those on pain. Acupuncture points are believed to stimulate the central nervous system (the brain and spinal cord) to release chemicals into the muscles, spinal cord, and brain. These chemicals either change the experience of pain or release other chemicals, such as hormones, that influence the body's self-regulating systems. The biochemical changes may stimulate the body's natural healing abilities and promote physical and emotional well-being. There are three main mechanisms:

1. Conduction of electromagnetic signals: Western scientists have found evidence that acupuncture points are strategic conductors of electromagnetic signals. Stimulating points along these pathways through acupuncture enables electromagnetic signals to be relayed at a greater rate than under normal conditions. These signals may start the flow of painkilling biochemicals, such as endorphins, and of immune system cells to specific sites in the body that are injured or vulnerable to disease.
2. Activation of opioid systems: Research has found that several types of opioids may be released into the central nervous system during acupuncture treatment, thereby reducing pain.
3. Changes in brain chemistry, sensation, and involuntary body functions: Studies have shown that acupuncture may alter brain chemistry by changing the release of neurotransmitters and neurohormones. Acupuncture also has been documented to affect the parts of the central nervous system related to sensation and involuntary body functions, such as immune reactions and processes whereby a person's blood pressure, blood flow, and body temperature are regulated.

Preclinical studies have documented acupuncture's effects, but they have not been able to fully explain how acupuncture works within the framework of the Western system of medicine.

From the World Health Organization

Traditional Medicine

• The term "traditional medicine" refers to ways of protecting and restoring health that existed before the arrival of modern medicine. As the term implies, these approaches to health belong to the traditions of each country, and have been handed down from generation to generation. Traditional systems in general have had to meet the needs of the local communities for many centuries. China and India, for example, have developed very sophisticated systems such as acupuncture and ayurvedic medicine. In practice, the term "traditional medicine" refers to the following components: acupuncture, traditional birth attendants, mental healers and herbal medicine.
• Over the years, the World Health Assembly has adopted a number of resolutions drawing attention to the fact that most of the populations in various developing countries around the world depends on traditional medicine for primary health care, that the work force represented by practitioners of traditional medicine is a potentially important resource for the delivery of health care and that medicinal plants are of great importance to the health of individuals and communities.
• Through its Traditional Medicine Programme, the World Health Organization (WHO) supports Member States in their efforts to formulate national policies on traditional medicine, to study the potential usefulness of traditional medicine including evaluation of practices and examination of the safety and efficacy of remedies, to upgrade the knowledge of traditional and modern health practitioners, as well as to educate and inform the general public about proven traditional health practices.
• WHO is working closely with 19 Collaborating Centres in ten countries (Belgium, China, Democratic People's Republic of Korea, Italy, Japan, Republic of Korea, Romania, Sudan, United States of America and Vietnam).
• A genuine interest in various traditional practices now exists among practitioners of modern medicine and growing numbers of practitioners of traditional, indigenous or alternative systems are beginning to accept and use some of the modern technology. This will help foster teamwork among all categories of health workers within the framework of primary health care. The reasons for the inclusion of traditional healers in primary health care are manifold: the healers know the sociocultural background of the people; they are highly respected and experienced in their work; economic considerations; the distances to be covered in some countries; the strength of traditional beliefs; the shortage of health professionals, particularly in rural areas, to name just a few.
• A large proportion of the population in a number of developing countries still relies on traditional practitioners, including traditional birth attendants, herbalists and bone-setters and on local medicinal plants to satisfy their primary health care needs. WHO estimates that traditional birth attendants assist in up to 95% of all rural births and 70% of urban births in developing countries.
• Traditional medicine has maintained its popularity in a number of Asian countries, such as China, India, Japan and Pakistan. In China, for example, traditional medicines (herbal preparations) account for 30% to 50% of the total medicinal consumption. In 1993, the total sales of herbal medicines amounted to more than US$ 2.5 billion. In Japan, from 1974 to 1989, there was a 15-fold increase in Kampoh ("Chinese method") medicinal preparations in comparison with only 2.6-fold increase in the sales of mainstream pharmaceutical products. The Japanese per capita consumption of herbal medicine appears to be the highest in the world.
• During the last decade, there has also been a growing interest in traditional and alternative systems of medicine in many developed countries. One-third of American adults have used alternative treatment and 60% of the public in the Netherlands and Belgium, and 74% in the United Kingdom are in favour of complementary medicine being available within the framework of the National Health Service. A survey among Member States of the European Union in 1991, identified about 1400 herbal drugs used in the European Economic Community.
• Medicinal plants are the oldest known health-care products. Their importance is still growing although it varies depending on the ethnological, medical and historical background of each country. Medicinal plants are also important for pharmacological research and drug development, not only when plant constituents are used directly as therapeutic agents, but also when they are used as basic materials for the synthesis of drugs or as models for pharmacologically active compounds.
• Legislative controls in respect of medicinal plants have not evolved around a structured control model. There are different ways in which countries define medicinal plants or herbs. As a result, different approaches have been adopted with regard to licensing, dispensing, manufacturing and trading in order to ensure the safety, quality, and efficacy of medicinal plant preparations.
• Herbal medicines are assuming greater importance in the primary health care of individuals and communities in many developing countries and there has been an increase in international trade in herbal medicines. However, in most countries the herbal medicines market is not adequately regulated, and the products are therefore unregistered and often not controlled by regulatory bodies. The establishment of regulation and registration procedures has become a major concern in both developed and developing countries.
• WHO has compiled a list of medicinal plants which are widely used in primary health care. In July 1996, a WHO scientific group involving 100 experts from various countries around the world adopted the list which includes 28 monographs of 28 medicinal plants originally prepared by the WHO Collaborating Centre for Traditional Medicine in Chicago, Illinois, United States of America.

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