How Does Moxibustion Possibly Work?

Moxibustion is a millennia-old technique of traditional Chinese medicine that, like acupuncture, uses specific points on the body to promote healing. While acupuncture inserts needles into the skin, moxibustion applies heat by burning medicinal herbs over or near acupuncture points. Although it has been widely practiced for more than two thousand years, this technique remains less known in the West compared with acupuncture, mainly due to the scarcity of scientific studies explaining how it works. Understanding the mechanisms of action of moxibustion is fundamental for it to be accepted by Western medicine and able to benefit a greater number of patients.

This study aimed to investigate the possible mechanisms by which moxibustion produces its therapeutic effects. The researcher conducted a comprehensive review of the scientific literature, analyzing both experimental and clinical studies. To facilitate the understanding of the effects of moxibustion, the author developed a technique called local somatothermal stimulation, which reproduces only the heat effect of traditional moxibustion, eliminating other factors such as smoke and herbal substances. This technique applies controlled heat at approximately 42 degrees Celsius (107.6°F) over specific points on the body, without direct contact with the skin, thereby avoiding burns or injuries.

The methodology included experiments in laboratory animals and biochemical analyses to understand how heat applied to specific points on the skin can affect distant internal organs.

The results revealed that moxibustion works through temperature-related and non-temperature-related mechanisms. When heat is applied to specific points on the skin, it triggers an impressive cascade of biological events. The study demonstrated that thermal stimulation of certain points can relax internal muscles, such as the sphincter that controls bile flow in the liver, through the release of nitric oxide, a substance that acts as a neural messenger. More surprisingly, it was discovered that the application of heat to specific points on the skin induces the production of protective proteins called heat shock proteins in the corresponding organs.

For example, when heat is applied to point LR-14, located in the territory of the seventh intercostal nerve, the liver produces these protective proteins, but the heart does not. Conversely, when heat is applied to point PC-6, innervated by the median nerve, the heart produces protective proteins, but the liver does not. This finding suggests that there is specific communication between skin points and internal organs, following the meridian concepts of traditional Chinese medicine. Furthermore, the study showed that this prior heat stimulation protects organs against severe injury caused by lack of oxygenation followed by reoxygenation, a common phenomenon in heart attacks and other serious medical conditions.

For patients, these findings suggest that moxibustion may have important therapeutic applications, especially in protecting vital organs against injury. The technique could potentially be used as a way of preparing the body for medical procedures that involve a risk of injury from lack of oxygenation, such as cardiac surgery or transplants. For health professionals, the study offers a solid scientific basis for understanding how moxibustion works, which can facilitate its integration with conventional treatments. The finding that different points on the skin communicate specifically with different internal organs validates aspects of the traditional Chinese medicine theory of meridians and opens possibilities for the development of more precise and effective treatment protocols.

The non-temperature-related mechanisms, including the effects of herbal smoke and infrared radiation, also deserve consideration in therapeutic planning.

It is important to recognize some important limitations of this study and safety considerations. The research was conducted primarily in laboratory animals, and although it provides valuable insights into the biological mechanisms, more rigorous clinical studies in humans are needed to confirm the efficacy and safety of moxibustion. The study also revealed that thermal stimulation can cause mild oxidative stress and small cellular damage in the corresponding organs, which, although it may be beneficial as a form of "preconditioning," requires special caution in patients with chronic liver or heart diseases. In addition, traditional moxibustion is not without risks, and may cause burns, allergic reactions, and infections if not performed properly.

The author concludes that, although the mechanisms of moxibustion are beginning to be scientifically understood, large-scale controlled clinical trials are needed to definitively establish its efficacy and safety, thus allowing this millennia-old technique to be fully accepted and integrated into modern Western medicine.