How Does Acupuncture Actually Work?
People ask me this all the time, and I love answering it, because modern science keeps confirming what acupuncturists have seen in their patients for thousands of years.
Acupuncture Points Are Not Random Spots
Many acupuncture points sit right on motor points, the places where a nerve enters a muscle and nerve endings, small blood vessels and connective tissue are packed closely together. Researchers have been mapping this overlap since the 1970s, and many classic acupuncture points also line up with the trigger points that physical therapists and pain doctors treat.
What Happens There When You’re Hurting
When an area is injured, inflamed or under stress for a long time, the chemistry in and around those points changes. Researchers at the National Institutes of Health sampled the fluid inside painful trigger points and found higher levels of pain and inflammation messengers, including substance P, bradykinin, CGRP, serotonin, norepinephrine and inflammatory cytokines. The tissue was also more acidic than healthy muscle. In other words, the biochemistry gets stuck, and the area keeps sending pain and tension signals long after the original injury.
What the Needle Does
A fine acupuncture needle stimulates the nerve fibers at the point, and your nervous system answers. Acupuncture triggers the release of your body’s own natural pain relievers: endorphins, enkephalins and dynorphins. When researchers block those receptors with a medication called naloxone, much of the pain relief goes away, which shows the effect comes from real biochemistry.
Lab research at the University of Rochester found that needling also releases adenosine in the surrounding tissue, a natural molecule that calms pain and inflammation. In 2021, a Harvard Medical School team published a study in the journal Nature that traced the exact nerve fibers that carry the signal from ST 36, a point on the lower leg, to the vagus nerve and adrenal glands to calm inflammation throughout the body.
So the needle doesn’t only work where it’s placed. It sends a message through your nerves to your spinal cord and brain, and your body responds by releasing its own chemistry to reset that area and the systems connected to it.
The Interstitium: A Newly Discovered Network
In 2018, researchers from NYU and Mount Sinai Beth Israel published a discovery in Scientific Reports. Layers of tissue long thought to be dense connective tissue are actually a network of fluid-filled spaces held together by collagen. It runs under the skin, around blood vessels, through the fascia between muscles and along the lining of the organs. They called it the interstitium and proposed that it be recognized as an organ in its own right. It went unnoticed for so long because the standard way of preparing tissue for the microscope drains the fluid and collapses these spaces.
Dr. Neil Theise, one of the lead researchers, suggested the interstitium may help explain how acupuncture works. Since then, a research team in Beijing has followed this fluid with MRI and fluorescent tracers. They found that most acupuncture points at the hands and feet connect to long-distance pathways of interstitial fluid. The research is still young, but it’s exciting to watch science map structures that acupuncture has worked with all along.
Did You Know? The first acupuncture tools were sharpened stones called bian. Later, Chinese healers made needles from bone, including fish bones, and from bamboo, thousands of years before the fine, sterile, single-use stainless steel needles I use today!
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