THE CENTER WITHIN · EVIDENCE LIBRARY

Needle-based therapy for pain, anxiety, sleep and autonomic balance

Acupuncture

A – Strong (chronic pain) · B – Moderate (anxiety, sleep) · C – Emerging (HRV)11 verified peer-reviewed articles

WHAT THE RESEARCH SHOWS

Acupuncture is the most rigorously studied modality in this library. For chronic pain, a landmark individual- patient-data meta-analysis (39 trials, 20,827 patients) found acupuncture outperformed both sham and no- acupuncture controls, with effects largely persisting at one year. A 2025 US trial designed to inform Medicare coverage found benefits in older adults. For the nervous system specifically, a 2023 meta-analysis of randomized trials found real (verum) acupuncture increased high-frequency HRV, a parasympathetic marker, while sham did not. A 2026 meta- analysis of 20 RCTs found manual acupuncture reduced anxiety compared with sham and usual care. Randomized trials also show improved sleep quality, including a sham-controlled trial in people with depression and insomnia. The evidence is honestly mixed in places. The Cochrane review of chronic low back pain found the difference versus sham was small and below the threshold for clinical importance, even though acupuncture beat no treatment.

the studies,

READ THE EVIDENCE

11 of 11 studies

A – StrongChronic pain: individual patient data meta-analysis of 20,827 patientsIndividual patient data meta-analysis · Tension / pain

IN PLAIN LANGUAGE

Pooling raw data from nearly 21,000 patients, acupuncture reduced chronic pain more than both sham needling and usual care, and most of the benefit was still present a year later. The authors conclude that referral for acupuncture is a reasonable option for chronic pain.

Study type: Individual patient data meta-analysis
Who was studied: 39 high-quality RCTs, 20,827 patients (musculoskeletal, osteoarthritis, headache, shoulder pain)
Outcome area: Tension / pain
Key finding: Acupuncture was superior to both sham and no-acupuncture control for each pain condition (all P < .001). Treatment effects decreased only about 15% at one year.
Evidence grade: A – Strong
Limitations: Effect versus sham was modest (~0.2 SD); effect size depended on the type of control.
Citation: Vickers AJ, Vertosick EA, Lewith G, et al. Acupuncture for Chronic Pain: Update of an Individual Patient Data Meta-Analysis. J Pain. 2018;19(5):455-474.

PubMed 29198932 DOI 10.1016/j.jpain.2017.11.005

C – EmergingAcupuncture increases parasympathetic tone (HRV meta-analysis)Systematic review & meta-analysis of RCTs · Parasympathetic

IN PLAIN LANGUAGE

When researchers compared real acupuncture with placebo needling, only real acupuncture shifted heart rate variability toward the parasympathetic (rest-and-digest) side of the nervous system. More research is needed to confirm this.

Study type: Systematic review & meta-analysis of RCTs
Who was studied: 9 RCTs comparing real vs placebo acupuncture
Outcome area: Parasympathetic
Key finding: Real acupuncture produced significant changes in HF and LF/HF heart rate variability, indicating increased parasympathetic tone. Sham groups showed no significant change.
Evidence grade: C – Emerging
Limitations: Only 9 RCTs; primary study quality and heterogeneity limit certainty (authors urge caution).
Citation: Hamvas S, Hegyi P, Kiss S, Lohner S, McQueen D, Havasi M. Acupuncture increases parasympathetic tone, modulating HRV - Systematic review and meta-analysis. Complement Ther Med. 2023;72:102905.

PubMed 36494036 DOI 10.1016/j.ctim.2022.102905

B – ModerateAcupuncture for anxiety: meta-analysis of 20 RCTsSystematic review & meta-analysis (PROSPERO-registered) · Tension / anxiety

IN PLAIN LANGUAGE

Across 20 randomized trials, acupuncture reduced anxiety more than placebo needling or usual care, with only minor, temporary side effects. The authors call it a promising, safe option and note that more long-term research is needed.

Study type: Systematic review & meta-analysis (PROSPERO-registered)
Who was studied: 20 RCTs, 1,462 participants
Outcome area: Tension / anxiety
Key finding: Manual acupuncture reduced anxiety versus sham (SMD −1.06) and versus usual care/wait-list (SMD −1.35) after treatment. The effect versus sham persisted at follow-up. No severe adverse events.
Evidence grade: B – Moderate
Limitations: Very high heterogeneity versus sham (I² = 94%); follow-up benefit versus usual care not significant.
Citation: Jang A, Wenninger M, Lee H, Zheng S. Acupuncture for Anxiety: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. J Clin Psychol. 2026;82(4):479-494.

PubMed 41460176 DOI 10.1002/jclp.70079

B – ModerateElectroacupuncture improved sleep in depression (sham-controlled RCT)Patient- and assessor-blinded, sham-controlled RCT (32 weeks) · Parasympathetic / sleep

IN PLAIN LANGUAGE

In a well-designed trial, electroacupuncture improved sleep quality in people with insomnia and depression more than placebo acupuncture, and the benefit lasted for six months after treatment ended.

Study type: Patient- and assessor-blinded, sham-controlled RCT (32 weeks)
Who was studied: 270 adults with insomnia and depression
Outcome area: Parasympathetic / sleep
Key finding: Sleep quality (PSQI) improved by 3.6 points more than sham and 5.1 points more than control at week 8, sustained to week 32. Anxiety and depression scores also improved.
Evidence grade: B – Moderate
Limitations: Conducted in 3 hospitals in one city (Shanghai); generalizability to other settings unclear.
Citation: Yin X, Li W, Liang T, et al. Effect of Electroacupuncture on Insomnia in Patients With Depression: A Randomized Clinical Trial. JAMA Netw Open. 2022;5(7):e2220563.

PubMed 35797047 DOI 10.1001/jamanetworkopen.2022.20563

C – EmergingAcupuncture for insomnia (meta-analysis of 24 RCTs)Systematic review & meta-analysis · Parasympathetic / sleep

IN PLAIN LANGUAGE

Pooled trials suggest acupuncture may improve sleep quality compared with sleep medication, with benefits typically showing up after three or more weeks of treatment.

Study type: Systematic review & meta-analysis
Who was studied: 24 RCTs (15 in pooled analysis vs medication)
Outcome area: Parasympathetic / sleep
Key finding: Compared with sleep medication, acupuncture significantly improved PSQI scores, with benefits appearing after about 3 weeks of treatment.
Evidence grade: C – Emerging
Limitations: High heterogeneity (I² ~85–91%); many trials from a single region.
Citation: Kim SA, Lee SH, Kim JH, et al. Efficacy of Acupuncture for Insomnia: A Systematic Review and Meta-Analysis. Am J Chin Med. 2021;49(5):1135-1150.

PubMed 34049475 DOI 10.1142/S0192415X21500543

B – ModerateCochrane review: chronic low back pain (balancing evidence)Cochrane systematic review · Tension / pain

IN PLAIN LANGUAGE

The Cochrane review found acupuncture helped low back pain more than no treatment, but the difference compared with placebo needling was small. The authors suggest that cost, availability and patient preference can reasonably guide the choice.

Study type: Cochrane systematic review
Who was studied: 33 studies, 8,270 participants
Outcome area: Tension / pain
Key finding: Acupuncture was more effective than no treatment for pain and function in the immediate term. Versus sham, the pain difference (about 9 points on a 100-point scale) did not reach the clinically important threshold.
Evidence grade: B – Moderate
Limitations: Moderate to very low certainty; most studies at high risk of performance bias.
Citation: Mu J, Furlan AD, Lam WY, Hsu MY, Ning Z, Lao L. Acupuncture for chronic nonspecific low back pain. Cochrane Database Syst Rev. 2020;12(12):CD013814.

PubMed 33306198 DOI 10.1002/14651858.CD013814

A – StrongAcupuncture for chronic back pain in older adults (US multisite RCT)Multisite, 3-arm pragmatic RCT · Tension / pain

IN PLAIN LANGUAGE

In a large US trial designed to inform Medicare coverage, older adults who received acupuncture had meaningfully less back pain–related disability than those receiving usual care alone, with benefits lasting a year.

Study type: Multisite, 3-arm pragmatic RCT
Who was studied: 800 adults aged 65+ across 4 US health systems
Outcome area: Tension / pain
Key finding: Acupuncture improved back pain–related disability more than usual care at 6 and 12 months. Clinically meaningful improvement: 39–44% with acupuncture vs 29% with usual care.
Evidence grade: A – Strong
Limitations: Compared with usual care, not sham; unblinded by design.
Citation: DeBar LL, Wellman RD, Justice M, et al. Acupuncture for Chronic Low Back Pain in Older Adults: A Randomized Clinical Trial. JAMA Netw Open. 2025;8(9):e2531348.

PubMed 40938602 DOI 10.1001/jamanetworkopen.2025.31348

B – ModerateIndividualized acupuncture for chronic neck pain (716 participants)Multicenter RCT (24 weeks) · Tension / pain

IN PLAIN LANGUAGE

Acupuncture tailored to sensitive points reduced chronic neck pain more than placebo needling or waiting, and the benefits lasted six months. The improvement was modest in size.

Study type: Multicenter RCT (24 weeks)
Who was studied: 716 adults with chronic neck pain
Outcome area: Tension / pain
Key finding: Individualized acupuncture reduced neck pain more than sham and wait-list, with effects lasting through 24 weeks. The size of the difference did not reach the minimal clinically important difference.
Evidence grade: B – Moderate
Limitations: Incomplete blinding; clinical importance of the effect is uncertain.
Citation: Zhao L, Sun M, Yin Z, et al. Long-Term Effects of Individualized Acupuncture for Chronic Neck Pain : A Randomized Controlled Trial. Ann Intern Med. 2024;177(10):1330-1338.

PubMed 39222507 DOI 10.7326/M23-2425

B – ModerateAcupuncture for anxiety in Parkinson disease (double-blinded RCT)Double-blinded, sham-controlled RCT · Tension / anxiety

IN PLAIN LANGUAGE

In people with Parkinson disease, real acupuncture reduced anxiety more than placebo needling by the eight-week follow-up. The benefit appeared after treatment ended rather than immediately.

Study type: Double-blinded, sham-controlled RCT
Who was studied: 70 adults with Parkinson disease and anxiety
Outcome area: Tension / anxiety
Key finding: No difference at the end of treatment, but at 8-week follow-up the real acupuncture group had a 7-point greater reduction in anxiety (HAM-A) than sham.
Evidence grade: B – Moderate
Limitations: Single site; delayed effect; small sample.
Citation: Fan JQ, Lu WJ, Tan WQ, et al. Effectiveness of Acupuncture for Anxiety Among Patients With Parkinson Disease: A Randomized Clinical Trial. JAMA Netw Open. 2022;5(9):e2232133.

PubMed 36129711 DOI 10.1001/jamanetworkopen.2022.32133

C – EmergingAcupuncture for PTSD (meta-analysis)Systematic review & meta-analysis (GRADE) · Tension / trauma

IN PLAIN LANGUAGE

Early trials suggest acupuncture may reduce PTSD symptoms, but the evidence quality is low and larger studies are needed.

Study type: Systematic review & meta-analysis (GRADE)
Who was studied: 7 RCTs, 709 participants
Outcome area: Tension / trauma
Key finding: Very low to low quality evidence favored acupuncture for PTSD symptoms after treatment and at follow-up. No significant differences were found for anxiety or sleep.
Evidence grade: C – Emerging
Limitations: Very low to low quality of evidence; attrition concerns.
Citation: Grant S, Colaiaco B, Motala A, Shanman R, Sorbero M, Hempel S. Acupuncture for the Treatment of Adults with Posttraumatic Stress Disorder: A Systematic Review and Meta- Analysis. J Trauma Dissociation. 2018;19(1):39-58.

PubMed 28151093 DOI 10.1080/15299732.2017.1289493

B – ModerateAcupuncture vs massage for advanced cancer pain (IMPACT RCT)Multicenter pragmatic RCT (26 weeks) · Tension / pain

IN PLAIN LANGUAGE

For people living with advanced cancer, both acupuncture and massage reduced pain and improved fatigue, sleep and quality of life over six months. Neither was clearly better than the other.

Study type: Multicenter pragmatic RCT (26 weeks)
Who was studied: 298 adults with advanced cancer
Outcome area: Tension / pain
Key finding: Both acupuncture and massage reduced worst pain (by about 2.5 and 3.0 points) and improved fatigue, insomnia and quality of life, with no significant difference between them.
Evidence grade: B – Moderate
Limitations: No no-treatment control; comparative-effectiveness design.
Citation: Epstein AS, Liou KT, Romero SAD, et al. Acupuncture vs Massage for Pain in Patients Living With Advanced Cancer: The IMPACT Randomized Clinical Trial. JAMA Netw Open. 2023;6(11):e2342482.

PubMed 37962891 DOI 10.1001/jamanetworkopen.2023.42482

EDUCATIONAL DISCLAIMER

This library is for educational purposes and is not medical advice. Individual results vary. Consult a qualified provider before starting any new therapy. Citations were verified against PubMed on September 25, 2026.

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