Effect of Acupuncture on Pain, Fatigue, Sleep, Physical Function, Stiffness, Well-Being, and Safety in Fibromyalgia: A Systematic Review and Meta-Analysis

Fibromyalgia is a complex medical condition that affects millions of people around the world, characterized primarily by generalized and persistent pain in muscles and joints. In addition to pain, patients frequently face intense fatigue, sleep disturbances, muscle stiffness, and a significant reduction in overall well-being. This syndrome represents a challenge for both patients and healthcare professionals, as there is no established gold-standard treatment, and the associated medical costs can be up to 30% higher than those of healthy people. Fibromyalgia affects approximately 2% to 3% of the world population, being more common in women, people with obesity, and those with mental health issues.

Given that pharmacological treatments often cause side effects, medical guidelines recommend considering non-pharmacological therapies as a first-line treatment option.

This study had as its main objective to systematically evaluate the effects of acupuncture on various symptoms of fibromyalgia, including pain, fatigue, sleep quality, physical function, stiffness, and overall well-being. The researchers also sought to determine the safety of this treatment and to investigate whether different acupuncture parameters (such as type of stimulation, individualized versus standardized approach, and number of sessions) influence the therapeutic results. To do this, they conducted a systematic review and meta-analysis, which is a type of scientific study that combines and analyzes data from multiple previous studies to obtain more robust and reliable conclusions.

The methodology employed was rigorous and comprehensive. The researchers searched six important scientific databases, including PubMed, Embase, and Cochrane Library, from inception through September 2021. Only randomized or quasi-randomized controlled trials that compared real acupuncture (manual or electroacupuncture) with sham or placebo acupuncture in patients diagnosed with fibromyalgia were included. Real acupuncture involved the insertion of needles at specific points based on traditional Chinese medicine, while the control groups received sham acupuncture, in which needles are inserted at incorrect locations or do not adequately penetrate the skin.

In the end, thirteen studies were selected, totaling 715 participants, of which twelve could be included in the quantitative analysis.

The main results revealed that acupuncture demonstrated significant efficacy in two important areas: pain relief and improvement in overall well-being. For pain, the analysis showed that acupuncture provided an analgesic effect of small to moderate magnitude both in the period immediately after treatment and at long-term follow-ups. Specifically, patients who received real acupuncture showed statistically significant pain reduction compared to those who received sham treatment. As for overall well-being, the results were also favorable, with improvements maintained over the long term.

Subgroup analyses suggested that both manual acupuncture and electroacupuncture were effective, as were individualized and standardized approaches. Interestingly, the study indicated that more than ten sessions of personalized manual acupuncture may provide better analgesic results.

However, the study did not find convincing evidence that acupuncture is effective for other important symptoms of fibromyalgia. There was no significant improvement in fatigue, sleep quality, physical function, or muscle stiffness when compared to control treatments. These results should be interpreted with caution, considering the limited number of studies available for some of these symptoms and the variable quality of the evidence. As for safety, acupuncture proved to be a safe treatment, with no serious adverse events reported.

The side effects observed were mild and included local discomfort at needle insertion, small hematomas, occasional nausea, and, rarely, fainting.

The clinical implications of these findings are important for both patients and healthcare professionals. For patients with fibromyalgia, the results suggest that acupuncture can be considered a safe and potentially effective therapeutic option, especially for the management of chronic pain, which is often the most debilitating symptom of the condition. The fact that it is a non-pharmacological treatment is particularly relevant, considering that many patients experience significant side effects with conventional medications. For healthcare professionals, these data provide scientific evidence of moderate quality that can guide treatment decisions, especially in a condition where therapeutic options are limited and often unsatisfactory.

It is important to recognize the limitations of this study. The relatively small number of participants and included studies may have affected the precision of the results, particularly for symptoms such as fatigue, sleep, and physical function, where less data was available. In addition, complete blinding in acupuncture studies is technically challenging — although patients can be partially blinded as to the type of acupuncture they receive, the acupuncturists always know which treatment they are applying, which may introduce some bias. The methodological quality of the included studies also varied, with some presenting greater risk of bias than others.

In conclusion, this study provides scientific evidence that acupuncture can be a valuable tool in the therapeutic armamentarium for fibromyalgia, particularly for pain control and improvement of overall well-being. Although it did not demonstrate clear benefits for other important symptoms such as fatigue and sleep disturbances, its safety and efficacy for pain justify its consideration as part of a multimodal treatment plan. The authors recommend that future studies with larger samples and even more rigorous methodology be conducted to better define the role of acupuncture in the treatment of fibromyalgia and to explore the mechanisms by which it produces its therapeutic effects.