The Mechanism of Moxibustion: Ancient Theory and Modern Research

Moxibustion is an ancestral therapy that has been part of the traditional Chinese medicine system for over 2,500 years. Based on burning moxa, a substance derived from the Artemisia argyi plant, over specific points on the body, this technique is drawing increasing scientific interest today. The procedure consists of applying heat to so-called acupuncture points and can be performed directly, with direct contact of burning moxa on the skin, or indirectly, keeping distance through insulating materials such as ginger, garlic, or other elements. According to traditional Chinese medicine, moxibustion has the ability to "drain meridians and regulate qi-blood" and is used both for prevention and treatment of a wide variety of health conditions.

This study aimed to conduct a comprehensive review of the mechanisms by which moxibustion produces its therapeutic effects, integrating both traditional theories and the discoveries of modern scientific research. The researchers conducted an extensive analysis of the available scientific literature, examining three main aspects of moxibustion mechanisms: the thermal effects produced by burning moxa, the effects of the infrared radiation emitted during the process, and the pharmacological actions of the chemical substances present in moxa and its combustion products. The methodology involved a systematic review of experimental studies that investigated each of these mechanisms, including research that measured temperatures during treatment, analyzed radiation spectra, and identified active chemical components.

The results revealed fascinating findings about how moxibustion works in the human body. From a thermal perspective, burning moxa can reach temperatures of up to 890 °C in the flame, raising skin temperature to approximately 130 °C on the surface and 56 °C in deeper layers. This thermal stimulation affects both superficial and deep tissues of the skin, activating specialized receptors responsible for heat perception and promoting changes in local blood circulation. Regarding radiation, the researchers discovered that burning moxa emits infrared radiation in a specific range of 0.8 to 5.6 micrometers, with a peak near 1.5 micrometers.

Even more surprising was the discovery that there is remarkable consistency between the infrared spectra of traditional indirect moxibustion and the spectra of the acupuncture points themselves, both showing radiation peaks near 10 micrometers. In the chemical aspect, more than 60 different components have been identified in the leaves of artemisia and in the smoke produced by burning, including volatile oils, flavonoids, polysaccharides, and other bioactive compounds with antioxidant, anti-inflammatory, and immunomodulatory properties.

For patients and healthcare professionals, these findings have important implications for understanding and clinical application of moxibustion. The findings suggest that the therapeutic benefits do not result from a single mechanism but rather from a synergistic combination of thermal, radiative, and pharmacological effects. This explains why moxibustion has shown efficacy in conditions as diverse as digestive problems, joint pain, menstrual disorders, asthma, and aging-related issues. The research also demonstrates that different methods of moxibustion application produce distinct thermal profiles, which can guide professionals in choosing the most appropriate technique for each clinical situation.

The discovery of spectral correspondence between moxibustion radiation and acupuncture points offers a scientific basis for the specificity of points used in traditional Chinese medicine. For patients, this information provides greater confidence in the scientific basis of treatment, although it is important to emphasize that moxibustion should always be performed by qualified professionals due to the inherent risks of using heat and fire.

Despite significant advances in understanding the mechanisms of moxibustion, the study acknowledges several important limitations. There is still considerable distance between current knowledge and complete understanding of how moxibustion produces its therapeutic effects. Many of the reviewed studies were conducted in animal models, and the results may not translate directly to humans. In addition, the quality and composition of moxa can vary significantly depending on the region of origin and harvest season, which can influence therapeutic outcomes.

The safety of the smoke produced during burning also remains controversial, with some studies suggesting possible adverse effects. The authors emphasize that future research should adopt a more holistic approach, considering not only the local effects of moxibustion but also its interaction with the meridian system as a whole. There is also a need for the development of more advanced technologies to study the biophysical mechanisms involved and the conduct of more controlled clinical trials to definitively validate the therapeutic benefits observed in traditional practice.