Acupuncture: A Review of the Safety and Adverse Events and the Strategy of Potential Risk Prevention

Acupuncture is widely accepted as a therapeutic treatment by patients and healthcare providers globally. The safety record has been well established in acupuncture practice although some rare adverse events (AEs) were reported in the literature. While acupuncture-related AEs are generally defined as any undesirable event that occurs in patients during acupuncture treatment that may or may not be associated with the treatment, acupuncture-related adverse reactions (ARs) are defined as any undesirable or harmful reaction induced by trained practitioners practicing acupuncture treatment with standard doses. In this review, we clarify the relationship between AEs and ARs. Furthermore, we compile a list of acupuncture-related AEs reported in systematic reviews and meta-analysis articles. We find that serious acupuncture-related AEs are rare, with serious AEs occurring at a rate of approximately 0.04-0.08 per 10,000 treatments. The most likely serious AEs are pneumothorax, central and peripheral nerve injuries, heart injuries, abdominal organ injuries, infections, and needle breakage. Commonly reported minor AEs include bruising, hematoma, or bleeding at the needling site, as well as vasovagal reactions such as tiredness, dizziness, fainting, or residual pain at insertion points. The analysis identifies contributing factors for serious AEs being deep needle penetration, incorrect acupoint selection, and improper needle manipulation. It also addresses infections caused by contaminated needles, environmental factors, and inadequate skin disinfection. Moreover, other serious AEs, like needle breakage, are mostly due to aggressive manipulation and repeated reheating. Importantly, most acupuncture-related AEs are preventable. To avoid such AEs, acupuncturists in clinical practice should carefully select needling areas, be aware of cautions and contraindications of acupuncture, maintain safe acupuncture depth and hygiene, and strictly adhere to standard operating procedures.