Acupuncture is a treatment in which a practitioner inserts very thin needles into specific points on your body to relieve pain, reduce inflammation, and influence how your nervous system processes signals. It originated in traditional Chinese medicine thousands of years ago and is now one of the most widely studied complementary therapies in modern healthcare. Millions of people use it annually, and several major medical organizations recommend it for specific conditions.
How Acupuncture Works in Traditional Medicine
The traditional explanation centers on qi (pronounced “chee”), a vital energy believed to flow through a network of channels in the body called meridians. When qi flows freely, the body stays healthy. When it gets blocked, pain and illness follow. Acupuncture aims to restore that flow by stimulating specific points along the meridians using needles, pressure, heat, or suction.
There are hundreds of these acupuncture points mapped across the body, each associated with different organs and functions. A practitioner selects points based on your symptoms, sometimes choosing locations far from where you actually feel pain. A headache, for example, might be treated with needles in the hand or foot.
What Modern Science Says Is Happening
Researchers have identified several measurable biological effects that help explain why acupuncture works for certain conditions. The needles stimulate your body to release its own natural painkillers, specifically opioid peptides like enkephalin and dynorphin. These activate pain-control structures deep in the brain, producing genuine analgesic effects through the central nervous system.
Beyond pain relief, acupuncture influences multiple neural circuits and neurotransmitter systems. It can modulate how the brain processes pain signals by activating inhibitory pathways that dial down pain sensation. It also affects circuits in the thalamus and cortex that govern pain perception, emotion, and cognition. Research on the limbic and reward systems shows acupuncture can change the emotional and motivational dimensions of pain, not just the raw sensation itself.
There are circulatory effects too. Electroacupuncture at certain points on the head has been shown to improve blood circulation in areas of the brain involved in motor function, which may help recovery after stroke. The picture that emerges is not a single mechanism but a cascade of neurological and chemical responses triggered by precise needle placement.
Conditions With Strong Evidence
Acupuncture has the most research support for pain-related conditions. The National Center for Complementary and Integrative Health recognizes it as helpful for back pain, neck pain, knee pain from osteoarthritis, and postoperative pain. It can also relieve joint pain caused by aromatase inhibitors, drugs commonly prescribed to people with breast cancer.
The endorsements from mainstream medical organizations are notable. The American College of Physicians included acupuncture among its recommended first-line, non-drug treatments for both chronic and acute low-back pain in a 2017 guideline. The American College of Rheumatology and the Arthritis Foundation conditionally recommend it for osteoarthritis of the knee, hip, or hand.
Outside of pain management, evidence supports acupuncture for seasonal allergy symptoms, stress incontinence in women, and nausea and vomiting caused by cancer treatment. The American Academy of Otolaryngology included it as an option for allergic rhinitis. It may also improve quality of life and symptom control in people with asthma, though it hasn’t been shown to improve lung function directly.
What a Session Feels Like
If you’ve never had acupuncture, the idea of needles can sound intimidating. In practice, acupuncture needles are nothing like the hollow needles used for injections or blood draws. They’re solid, made of stainless steel, and extraordinarily thin. Most people barely feel them go in.
Once the needles are placed, you’ll likely notice sensations like dull aching, tingling, or a feeling of heaviness or numbness around the needle sites. These muscle sensations are considered a sign that the treatment is working. Your practitioner will typically ask you to report when you feel that deep heaviness. The needles stay in place anywhere from a few minutes to about 20 minutes, during which most people relax or even fall asleep.
A typical course of treatment involves multiple sessions, often weekly, with the total number depending on your condition. Some people notice improvement after one or two visits, while chronic conditions generally require a longer series.
Safety and Needle Standards
When performed by a trained practitioner, acupuncture carries very low risk. The most common side effects are minor bruising or soreness at needle sites. Serious complications are rare and almost always linked to inadequate training or improper technique.
Modern acupuncture practices use disposable, single-use stainless steel needles. This is the standard recommendation for avoiding cross-infection. Each needle is used once and then discarded in a puncture-proof container after sterilization. Gold and silver needles exist in traditional practice but are harder to keep sterile, so stainless steel dominates clinical settings today.
Practitioner Training and Licensing
In the United States, acupuncturists must complete an accredited acupuncture program, which typically involves three to four years of graduate-level education covering both traditional theory and biomedical sciences. They then pass the national certification exam administered by the National Certification Commission for Acupuncture and Oriental Medicine (NCCAOM) and obtain Clean Needle Technique certification. Licensing requirements vary by state, but most require the NCCAOM credential.
Some physicians, chiropractors, and physical therapists also practice acupuncture with additional training, though their education hours in acupuncture specifically are usually less extensive than those of dedicated acupuncturists. If acupuncture is something you’re considering, checking that your practitioner holds NCCAOM certification is a straightforward way to verify their training.