Effectiveness of acupuncture on anxiety disorder: a systematic review and meta-analysis of randomised controlled trials

Acupuncture for the treatment of generalized anxiety disorder shows promising results according to a large scientific study published by Chinese researchers in 2021. This work represents one of the most important reviews ever performed on the topic, gathering evidence from multiple studies to offer a clearer view of the effectiveness of this ancient therapy in the treatment of anxiety problems.

Generalized anxiety disorder has become a global mental-health problem, affecting approximately 7.6% of the Chinese population over a lifetime and constituting the largest group of mental disorders in Western societies. This condition manifests as excessive, uncontrollable, and often irrational worry, accompanied by physical symptoms such as tachycardia, muscle tension, pain, and difficulty relaxing. Although conventional treatments such as antidepressants and cognitive-behavioral therapy are considered first-line, many patients do not respond adequately or do not tolerate the side effects of medications, leading them to seek complementary therapies such as acupuncture.

To scientifically investigate the effectiveness of acupuncture in anxiety disorder, the researchers conducted a systematic review with meta-analysis, considered the gold standard for evaluating scientific evidence. They analyzed data from multiple international and Chinese scientific databases, searching for studies published between 2000 and 2019 that compared acupuncture with other treatments in patients with a confirmed diagnosis of anxiety disorder. Only randomized controlled trials were included, representing the most rigorous study type for evaluating medical treatments. In the end, twenty studies involving 1,823 patients were analyzed, all focused specifically on generalized anxiety disorder.

The results demonstrated that acupuncture was significantly more effective than control treatments in reducing anxiety symptoms. The effect size found was considered moderate, with a statistical value of -0.41, indicating a clinically relevant improvement. This effectiveness remained consistent when the researchers analyzed different subgroups of studies. Interestingly, acupuncture was more effective when symptoms were rated by the patients themselves than when rated by clinicians, suggesting that the benefits may be particularly perceptible in the subjective experience of well-being.

In addition, treatments shorter than six weeks showed superior results compared with longer-duration treatments, indicating that acupuncture can offer relatively rapid relief of anxiety symptoms.

In terms of safety and tolerability, acupuncture demonstrated a very favorable profile. Reported adverse effects were minimal and included mainly mild pain at the needling site, small bruises, sensation of dizziness during treatment, and minimal bleeding. All these effects are considered mild and transient. The dropout rate was low, less than 20% of patients, similar to or lower than that observed in control groups, indicating good treatment acceptability.

This compares favorably with anxiolytic medications, which frequently cause side effects such as drowsiness, dependence, and memory problems.

For patients suffering from generalized anxiety disorder, these results suggest that acupuncture may be a valuable therapeutic option, either as a primary treatment or as a complement to conventional therapies. The rapid onset of action observed is particularly attractive, since many anxiolytic medications take weeks to reach their full effect. For healthcare professionals, the study offers robust evidence to consider acupuncture as an integral part of the therapeutic plan, especially for patients who do not tolerate medications or who prefer less invasive approaches. The safety demonstrated makes acupuncture a low-risk option that can be offered with confidence.

However, the study has some important limitations that should be considered. All studies analyzed were conducted in China, which may limit the applicability of the results to other populations and cultures. The significant heterogeneity among studies indicates that the results should be interpreted with caution, since different acupuncture protocols and assessment methods may have influenced the results. In addition, most articles were published in Chinese, creating a possible regional publication bias.

Another limitation is that only generalized anxiety disorder was studied, so the results cannot be extrapolated to other anxiety disorders such as panic disorder, phobias, or social anxiety.

The findings of this study represent a significant advance in understanding the role of acupuncture in the treatment of anxiety, providing solid scientific evidence for a practice that has been used for thousands of years. Although more high-quality studies, conducted in different countries and populations, are needed to confirm these results, the current evidence is encouraging and suggests that acupuncture deserves serious consideration as an effective and safe therapeutic option for generalized anxiety disorder.