Acupuncture therapy is a treatment in which thin, sterile needles are inserted into specific points on the body to relieve pain, reduce inflammation, and influence how the nervous system processes signals. Rooted in traditional Chinese medicine but now widely used in Western clinical settings, it is one of the most studied complementary therapies in the world, with moderate-quality evidence supporting its use for several common pain conditions.
How Acupuncture Works in the Body
Traditional Chinese medicine explains acupuncture through the concept of qi (pronounced “chee”), a form of energy believed to flow through the body along pathways called meridians. These pathways connect acupuncture points to each other and to the body’s organs. In this framework, illness results from a blockage or imbalance of qi, and inserting needles at specific points restores that flow.
Modern research frames the mechanism differently. When a needle penetrates the skin, it stimulates sensory nerves that send signals up through the spinal cord and into the brain. This triggers a cascade of responses: the brain and pituitary gland release natural painkillers called endorphins, which bind to the same receptors targeted by opioid medications. At the same time, acupuncture influences a broad network linking the nervous system, hormone regulation, and immune function. It can prompt the release of various neurotransmitters and hormones, and the effects extend well beyond the needle site. Brain imaging studies show that acupuncture activates the limbic system, a set of structures involved in emotion, memory, and the regulation of internal organ activity.
These aren’t competing explanations so much as different lenses on the same phenomenon. The traditional map of meridians and points provides the clinical roadmap practitioners follow, while neuroscience increasingly explains why stimulating those points produces measurable physiological changes.
Conditions With the Strongest Evidence
Not every condition responds equally to acupuncture, and the quality of evidence varies. Here’s where the research is most convincing.
- Chronic low back and neck pain. A 2018 review of 12 studies with over 8,000 participants found acupuncture more effective than no treatment, and a separate analysis of nearly 2,000 participants showed it outperformed sham (fake) acupuncture. The American College of Physicians recommends acupuncture as a first-line nondrug option for chronic low back pain.
- Osteoarthritis. Data from 10 studies involving about 2,400 people showed acupuncture beat both no treatment and sham acupuncture for osteoarthritis pain, with the strongest results for knee osteoarthritis. The American College of Rheumatology conditionally recommends it for osteoarthritis of the knee, hip, or hand.
- Migraine and tension headaches. Moderate-quality evidence from 22 studies with nearly 5,000 people suggests acupuncture can reduce the frequency of migraines. For tension headaches, a separate evaluation of 12 studies with about 2,350 participants found similar benefits, though the evidence was rated moderate to low quality.
- Fibromyalgia. A 2019 review of 12 studies found acupuncture significantly better than sham acupuncture for pain relief in people with fibromyalgia.
- Seasonal allergies. An evaluation of 13 studies with over 2,300 participants found evidence that acupuncture may help relieve nasal symptoms. The American Academy of Otolaryngology includes it as an option clinicians can offer patients with allergic rhinitis.
What a Session Feels Like
Acupuncture needles are far thinner than the needles used for injections or blood draws. Made of stainless steel, they range from 26 to 40 gauge with a typical diameter under 300 micrometers, roughly the width of two or three human hairs. Most people feel a brief pinch or pressure when a needle goes in, sometimes followed by a dull ache, tingling, or warmth at the site. Sharp pain is uncommon, and if it occurs, you should tell your practitioner so the needle can be repositioned.
A typical session lasts 20 to 30 minutes once the needles are placed. You’ll lie on a padded table, and the practitioner will insert anywhere from a handful to two dozen or more needles depending on the condition being treated. Many people find the experience deeply relaxing, and some fall asleep during treatment. For chronic pain, most clinical trials use 6 to 12 sessions spread over 4 to 12 weeks, though your practitioner may adjust this based on how you respond.
Manual vs. Electroacupuncture
In traditional manual acupuncture, the practitioner inserts needles and may gently twist or manipulate them by hand. Electroacupuncture adds a small device that clips onto the needles and delivers a mild electrical current. The advantage of electroacupuncture is precision: the practitioner can set the exact frequency and intensity of stimulation, making treatments more standardized and reproducible.
Brain imaging research shows that electroacupuncture, particularly at low frequencies, produces more widespread brain activation than manual needling. Both methods activate the limbic system, but electroacupuncture engages additional brain regions involved in pain modulation and mood regulation. In practice, electroacupuncture is often chosen for conditions like stress incontinence. In one rigorous study of about 500 women, 18 sessions of electroacupuncture over six weeks reduced urine leakage, with roughly two-thirds of participants experiencing a 50 percent or greater improvement.
How Acupuncture Differs From Dry Needling
Dry needling uses the same type of thin, solid needle but comes from a completely different framework. Physical therapists and sports injury specialists perform dry needling based on anatomy, targeting muscles, nerves, and joints to release trigger points, increase blood flow, and relieve muscle tension. There’s no reference to meridians or qi.
The training gap is significant. Licensed acupuncturists complete a minimum of 750 hours of acupuncture-specific coursework plus at least 500 hours of supervised clinical training, including 400 hours of hands-on patient treatment. Dry needling requirements vary by state. In Arizona, for example, a physical therapist can perform it after completing a three-day course and submitting proof of completion to a regulatory board. Both approaches have clinical value, but they represent different philosophies, different training pipelines, and different treatment goals.
Safety and Side Effects
Acupuncture has a strong safety record. A meta-analysis published in BMJ Open found that about 9 out of 100 patients experience at least one side effect during a course of treatment, but roughly half of those are minor bleeding, soreness, or redness at the needle site, reactions that many practitioners consider a normal part of treatment rather than a complication.
Side effects that require additional medical attention occur in about 1 out of every 900 treatments. Serious adverse events, such as infection or organ puncture, are extremely rare: approximately 1 in every 10,000 patients over a full treatment series, or about 1 in every 125,000 individual treatments. The risk drops further when you see a licensed practitioner who uses single-use, sterile needles and has completed certified clean needle technique training.
Choosing a Qualified Practitioner
Licensing requirements differ by state, but the baseline standard involves graduating from a program accredited by the Accreditation Commission for Acupuncture and Oriental Medicine. This includes at least 450 hours of basic science courses covering anatomy, physiology, pathology, and related subjects, plus the 750 hours of acupuncture-specific training and 500 hours of clinical work mentioned above.
After completing their education, practitioners must pass board exams administered by the National Certification Board for Acupuncture and Herbal Medicine (formerly NCCAOM). The exams cover foundations of oriental medicine, acupuncture with point location, and biomedicine. Practitioners must also verify completion of a certified clean needle technique course. When choosing a provider, confirming board certification and active state licensure is the simplest way to ensure they meet these standards.