Acupuncture, from the Ancient to the Current

This review article offers a comprehensive perspective on the evolution of acupuncture, from its origins in the Neolithic period to its current status as a globally recognized integrative therapy. Acupuncture, characterized by the insertion of fine needles at specific points of the body, has its roots deeply embedded in traditional Chinese medicine, based on the concepts of Qi, meridians, and the balance between Yin and Yang. The history of acupuncture reveals periods of prosperity and decline. The earliest instruments were stone needles from the Neolithic period, evolving into bronze, iron, gold, and silver needles across dynasties.

The foundational text 'The Yellow Emperor's Classic of Internal Medicine' (200 BCE) established the systematic theory of acupuncture. During the Jin, Song, and Ming dynasties, the practice was refined, with the documentation of 365 acupuncture points and the creation of bronze statues for teaching. The modern period brought significant challenges, especially during the late Qing dynasty, when Western medicine gained prominence and acupuncture was deemed superstitious. In 1822 it was excluded from the Imperial Medical Institute, and it was even banned in 1929.

The revival of acupuncture began in 1949 with the establishment of the new China. Danan Cheng developed stainless steel needles in 1953, making treatment more comfortable and acceptable. Electroacupuncture emerged in the 1950s, offering objective parameters and increasing clinical effectiveness. The successful use of acupuncture as surgical anesthesia in the 1960s, including pneumonectomies, significantly accelerated its development.

Global dissemination of acupuncture accelerated after 1971, when James Reston reported his experience with acupuncture after appendectomy in China. The U.S. National Institutes of Health recognized its effectiveness and included it in health insurance systems. Currently, 183 of 202 countries and regions worldwide use some form of Chinese acupuncture.

In 2010, UNESCO inscribed Chinese acupuncture on the Representative List of the Intangible Cultural Heritage of Humanity. Modern scientific research has provided robust evidence of acupuncture's effectiveness. For analgesia, a meta-analysis including 20,827 patients from 39 studies demonstrated efficacy for musculoskeletal pain, osteoarthritis, chronic headache, and shoulder pain. Proposed mechanisms include segmental inhibition, activation of endogenous opioid pathways, and modulation of central sensitization.

Neuroimaging studies have revealed the role of the amygdala in antinociceptive effects. For gastrointestinal disorders, randomized controlled trials have shown that 8 weeks of electroacupuncture significantly increased spontaneous bowel movements in patients with severe chronic functional constipation, with effects sustained for 20 weeks. Acupuncture has been shown to regulate gastric motility, gastrointestinal hormones, and autonomic nervous system functions. In the treatment of stroke, acupuncture is recommended by the WHO as a complementary strategy.

Studies show benefits in improving neurological deficits, dysphagia, cognitive impairment, and lower-limb dysfunction. Mechanisms include promotion of neurogenesis, regulation of cerebral blood flow, anti-apoptosis, and improvement of long-term potentiation. Other conditions with positive evidence include stress urinary incontinence, primary insomnia, Alzheimer's disease, and primary Sjögren's syndrome. Frequently used points include Zusanli (ST-36), Baihui (GV-20), Quchi (LI-11), and Hegu (LI-4).

However, there are also important negative findings. The PCOSAct trial showed that acupuncture did not increase live births in Chinese women with polycystic ovary syndrome. Studies on menopausal hot flashes also failed to demonstrate superiority over noninvasive sham acupuncture. These limitations underscore the importance of rigorous research protocols and consideration of individualized treatments based on TCM syndrome differentiation.

The future of acupuncture lies in the continued integration of high-quality clinical evidence with basic research elucidating mechanisms of action. This dual approach will enable significant advances in the understanding and application of this centuries-old therapy in the context of modern medicine.