How it works · The science
The short version
Proposed mechanisms
Mostly animal research
Needling stimulates sensory nerves in skin, muscle and the deeper connective tissue. In mice, needling also releases a local signaling molecule, adenosine, and its pain-reducing effect depended on adenosine receptors.4
Strong in animals; limited in humans
Animal studies show electroacupuncture can engage the body’s own pain-control chemistry — endogenous opioids, serotonin and norepinephrine — with different stimulation frequencies releasing different opioid peptides.2,3 A small human brain-imaging study found real acupuncture changed opioid-receptor binding more than sham.6
Hypothesis with some lab support
One hypothesis is that turning a needle winds connective tissue around it, sending mechanical signals to nearby cells.5 It’s plausible and partly shown in tissue studies, but unproven as the explanation for clinical effects.
Animal research
In mice, low-intensity electroacupuncture at a specific leg point activated a nerve pathway to the adrenal glands that dampened inflammation.7 Researchers suggest some effects work through body-region-specific “somato-autonomic” reflexes.8
In people
The strongest human evidence is clinical, not mechanistic. The largest analysis — pooling raw data from 39 trials and more than 20,000 people with chronic pain — found acupuncture did better than both sham acupuncture and no acupuncture. The advantage over sham was small, the advantage over usual care larger, and the authors concluded effects can’t be explained by placebo alone, while noting non-specific factors also contribute.1
What remains uncertain: whether the animal pathways above explain these clinical effects, how much depends on specific points, and whether they apply to every condition. Evidence differs a lot by condition — see the research library.
Traditional Chinese Medicine view · a separate framework
Traditional Chinese Medicine describes health in terms of Qi (often translated as vital energy), Blood, Yin and Yang, and organ systems connected by channels, or meridians. A TCM practitioner identifies a pattern from your symptoms, tongue and pulse, and chooses points and treatments for that pattern.9
These are historical, descriptive concepts — a different language from biomedicine, not a claim about anatomy. Dr. Kristina explains your care in both: the TCM pattern she sees, and familiar medical terms.
Each source was checked against its PubMed record or official page.
