Researchers led from Memorial Sloan Kettering combined the original patient data from 39 high-quality randomized trials covering back and neck pain, osteoarthritis, chronic headache, and shoulder pain. For each condition, acupuncture reduced pain more than sham acupuncture and more than care without acupuncture, and about 85% of the benefit was still there a year later.
Acupuncture for Chronic Pain: Update of an Individual Patient Data Meta-Analysis
Vickers AJ, Vertosick EA, Lewith G, et al. The Journal of Pain. 2018;19(5):455–474.
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Trial results are averages across groups of patients. Individual results vary.