A Research-Backed Overview
What peer-reviewed research tells us about a 2,500-year-old thermal therapy — examined through the lens of modern clinical trials and mechanistic science.
Understanding the Therapy
Moxibustion is a form of external heat therapy rooted in traditional Chinese medicine (TCM). It involves burning dried mugwort (Artemisia vulgaris, or moxa) at or near acupuncture points on the body's surface. Unlike acupuncture, which uses physical needle insertion, moxibustion delivers a combination of thermal stimulation, infrared radiation, and pharmacological compounds from the burning herb — each of which may contribute to its therapeutic effects.
A moxa cone is placed directly on the skin surface at an acupoint and ignited. This method can be scarring (suppurative) or non-scarring depending on whether the cone is removed before it fully burns. Ancient practitioners valued scarring moxibustion for refractory chronic conditions, with a tradition of "where there is moxibustion sore, there is cure."
An insulating material — most commonly ginger, garlic, or salt — is placed between the burning moxa and the skin. This is the most widely used method in clinical studies. The insulator modifies the temperature curve and is chosen according to the therapeutic goal. Ginger and garlic are active auxiliary materials whose own compounds contribute pharmacological effects.
A cigar-shaped moxa roll is held 2–3 cm above the acupoint and moved in gentle, circular, or pecking motions. This method avoids direct skin contact entirely, making it easier to standardize in clinical trials and suitable for sensitive populations. It was the most frequently used technique in the 10-year systematic review by Kim et al. (2011).
Contemporary adaptations include microwave moxibustion, laser moxibustion, and electrothermal moxibustion — devices designed to simulate the thermal and radiation effects of traditional moxa while standardizing parameters. These newer forms are used in research settings to help isolate specific mechanisms of action.
How It Works
Modern mechanistic research on moxibustion identifies four primary pathways: thermal effects on local tissue, infrared radiation penetrating the skin, pharmacological actions from moxa combustion products, and activation of the body's meridian and acupoint system. Researchers note that no single mechanism fully explains its effects — the current consensus is that these pathways act in combination.
Burning moxa without flame produces temperatures of approximately 548–890°C at the cone's surface. At the skin, a single 2 mg moxa cone can raise tissue temperature to 130°C externally and 56°C inside the skin at the stimulation site. The warm-heat effects closely relate to warm receptors (WRs) and the polymodal receptor (PR). Moxibustion stimulation in the 40–60 minute range has been shown to raise pain threshold in proportion to burning duration and moxa quantity.
— Deng & Shen (2013)Burning moxa emits both visible light and infrared (IR) radiation. The spectrum ranges from 0.8 to 5.6 µm, with a peak near 1.5 µm in the near-infrared (NIR) portion. Research found a "surprising consistency" between the infrared spectra of three types of indirect moxibustion and the unified spectrum of acupoints — both peak near 10 µm — suggesting that resonance between the radiation and the acupoint may play a specific therapeutic role. NIR can penetrate approximately 10 mm into the skin, reaching tissues and being absorbed by connective tissue, blood vessels, and nerves.
— Deng & Shen (2013); Ma & Ren (2024)Mugwort (Artemisia argyi) contains more than 60 identified volatile oil components, including 1,8-cineole, alkenes, camphor, borneol, and benzene series compounds. Moxa is rich in flavonoids and polysaccharides with strong antioxidant activity. Its combustion products — including brown tar-like substances — penetrate through skin damaged by the burning process. Methanol extracts of moxa combustion products showed strong free-radical scavenging and lipid peroxidation-clearing activity. Ginger and garlic used in indirect moxibustion contribute their own active compounds (gingerol and allicin) via the skin under heat.
— Deng & Shen (2013)One documented thermal effect of moxibustion is the induction of heat shock proteins (HSPs) in local tissues. HSPs are a class of functionally related proteins involved in the folding and unfolding of other proteins. As an endogenous protective mechanism, HSPs can be synthesized in cells in response to hyperthermia and environmental stress. The HSPs induced by moxibustion may represent an important contributing factor in its mechanism of action, particularly for tissue protection and repair.
— Deng & Shen (2013)Moxibustion acts on both the central and autonomic nervous systems. Central nervous action is studied from the brain-gut axis perspective — research shows the CNS can directly regulate gastrointestinal tract function via moxibustion. Neurotransmitters secreted by the autonomic nervous system act on the enteric nervous system, participating in gastrointestinal regulation. Moxibustion at the foot Sanli point has been shown to improve free radical metabolism, regulate intestinal flora structure, and maintain intestinal flora homeostasis. Wang et al. (2025) identified cortical regions — DLPFC, M1, S1, SMA, PMC — as key areas for investigating moxibustion's neurological effects in low back pain.
— Ma & Ren (2024); Wang et al. (2025)Immune dysfunction is considered an important cause of many diseases, and the therapeutic effect of moxibustion is partly to stimulate the body's specific immune function — so that overexpressed or reduced immune function tends to normalize. Research has shown that immunoglobulin levels of elderly patients increased significantly after moxibustion was applied to the Shenque acupoints. Additionally, after moxibustion at the foot-sanli point in athletes, the decline of humoral immune function could be suppressed. Moxa smoke has also been found to raise white blood cell counts in mice, protecting the thymus and spleen to improve overall immunity.
— Ma & Ren (2024)Clinical Evidence
The following findings are drawn directly from peer-reviewed randomized controlled trials and systematic reviews. Evidence quality varies across conditions, and findings are presented with appropriate context — including where results were neutral or inconclusive.
Chronic non-specific low back pain (CNLBP) is the most common subtype of low back pain in clinical practice, representing 80–90% of all LBP cases. Epidemiological research shows nearly 80% of adults have at least one LBP episode in their lifetime, with 22–65% reporting recurrence at least once a year.
Wang et al. (2025) — a registered, multicenter, single-blind RCT protocol with 150 participants across three tertiary Chinese hospitals — was designed to comprehensively evaluate the therapeutic efficacy of moxibustion for CNLBP. Acupoints used are bilateral BL23 (Shenshu), GV3 (Yaoyangguan), and GV8 (Jinsuo), with sessions lasting 30 minutes, three times per week for 8 weeks.
Based on prior data, the trial estimated an effect size of approximately 0.5 (moderate) for moxibustion treatment, with outcomes assessed across pain intensity (NRS), functional disability (ODI), fear-avoidance beliefs (FABQ), and quality of life (SF-36). Wang et al. note that clinical observations and self-reported outcomes suggest moxibustion may improve both physiological and psychological wellbeing in CNLBP patients.
Note: Wang et al. (2025) is a prospective study protocol. Results are anticipated but not yet published. Prior clinical observations support its inclusion as a promising area of ongoing rigorous research.
Knee osteoarthritis (KOA) is among the most frequently studied conditions in moxibustion research. The 10-year systematic review by Kim et al. (2011) identified three RCTs examining KOA, totaling 59 to 79 participants per study.
In one high-quality study (Chen 2008), moxa stick moxibustion applied 10 times produced significant improvements in PRI, VAS, and McGill Pain Questionnaire scores, with cured or markedly effective outcomes in 49 of 57 participants versus 12 of 50 in the control group (P < 0.001).
A separate knee OA trial by Sun (2008a) found that moxibustion (applied 1/day at 29 participants) produced significant improvements in symptom scores 10 and 20 times into treatment, as well as cured or markedly effective rates after treatment and 2 months later compared to a medication comparison group (P < 0.05). Ma & Ren (2024) noted that the light effect of moxibustion is "very effective in improving stiffness and physical dysfunction" and "especially advantageous in treating diseases such as osteoarthritis of the knee."
Ulcerative colitis is one of the few conditions for which moxibustion data was sufficient for meta-analysis in the Kim et al. (2011) systematic review. Two studies involving ulcerative colitis patients were pooled.
The combined analysis found that indirect moxibustion for 1 or 3 months was significantly more effective than medication in two ulcerative colitis studies, with a relative risk of 2.20 (95% CI: 1.37–3.52; P = .001; I² = 0%), indicating no statistically significant heterogeneity.
One individual RCT (Wang 2006) found that moxa cone applied 30 times over 10 days produced significantly better total effective rates for symptoms, HBS, and FDI scores versus a medication control (P < 0.05), with cured or markedly effective rates of 22/30 in the moxibustion group versus 9/30 in controls (P = .002).
Breech presentation — when the fetus is positioned feet-first near the end of pregnancy — is the most frequently studied condition in moxibustion research, with 7 RCTs in the Kim et al. (2011) review. The standard intervention is moxa stick applied at the BL67 (Zhiyin) acupoint.
One high-quality trial (Yang 2006; n = 103 moxibustion, 103 controls) found a significantly higher success rate for cephalic presentation at delivery in the moxibustion group (P < 0.05). Another large-scale study (Cardini 2005; n = 65, 58 controls) found that moxibustion yielded a significantly higher cephalic presentation rate compared to no treatment (P < 0.01).
The meta-analysis of this data, however, showed that moxa stick treatment for 1–2 weeks did not demonstrate a statistically significant additional effect compared to no treatment control (RR: 1.19; 95% CI 0.88–1.60; P = .26; I² = 40%). Moxibustion plus posture care showed a small additional effect over posture care alone (RR: 1.51; P = .01), though heterogeneity was marked (I² = 86%). The evidence is promising but methodologically limited.
The 2026 RCT by Sowmiya et al. — published in the Journal of Acupuncture Research — is one of the first randomized controlled trials to directly compare combined acupuncture plus moxibustion against acupuncture alone in chronic rhinosinusitis (CRS).
60 CRS patients aged 18–45 were randomized 1:1. Both groups received acupuncture at EX1 (Yintang), LI4 (Hegu), GB14 (Yangbai), and GB20 (Fengchi) three times weekly for 6 weeks. The study group additionally received 5 minutes of indirect moxa stick moxibustion at each point. Primary outcome was the validated SNOT-22 score; secondary outcomes were CRP and ESR (inflammatory biomarkers).
The combined group showed significantly greater SNOT-22 improvement (29.2 ± 6.64 to 12.9 ± 4.87) compared to acupuncture alone (27.1 ± 4.53 to 25.6 ± 4.18; p < 0.001). CRP decreased significantly more in the study group (5.53 to 2.84 mg/L vs. 5.51 to 5.03 mg/L; p < 0.001). ESR also improved significantly more in the combined group (53.1 to 22.9 vs. 52.2 to 48.0 mm/h; p < 0.001). There was a 100% completion rate.
Rheumatoid arthritis (RA) was evaluated in one RCT (Li 2006a) included in the Kim et al. (2011) review. In this study (30 moxibustion subjects vs. 30 medication controls), moxa stick moxibustion 5 times per week for 3 months was compared against medication. Results showed statistically significant improvements in improved rate, ACR 50% effective rate, and NSAID-withdrawal ratio (P < 0.05). Swelling and joint grasping power also showed significant changes.
For myofascial pain syndrome (Chen 2008), moxa stick applied 10 times showed significant improvements in PRI, VAS, and McGill Pain Questionnaire scores (P < 0.001). Ankylosing spondylitis (Jia 2006) showed improvements in symptom, ESR, and CRP outcomes, and morning stiffness, though some secondary outcomes were neutral.
Importantly, Kim et al. note that for some musculoskeletal conditions such as ankylosing spondylitis, rheumatoid arthritis, and cervical spondylosis, moxibustion did not show additional benefit over co-interventions alone — underscoring the importance of condition-specific evidence interpretation.
Cortical & Neural Mechanisms
One of the frontier questions in moxibustion research is whether its analgesic effects are mediated partly through changes in how the brain processes and modulates pain. Wang et al. (2025) designed their multicenter RCT protocol specifically to investigate this question, incorporating functional near-infrared spectroscopy (fNIRS) to measure cortical activation patterns in CNLBP patients before and after moxibustion treatment.
The researchers note that previous studies have demonstrated that CNLBP induces structural and functional alterations in brain regions associated with pain modulation and postural control — with impaired postural control potentially contributing to the persistence and recurrence of pain. fNIRS will assess activation in bilateral DLPFC, M1, S1, SMA, and PMC — cortical areas that play critical roles in human pain modulation and postural control.
From a neurological perspective, Ma & Ren (2024) describe that the central nervous action mechanism of moxibustion is studied from the brain-gut axis perspective, and that the central nervous system of the brain can be directly involved in the regulation of the gastrointestinal tract. The autonomic nervous system component of moxibustion's action includes neurotransmitters that act on the enteric nervous system and regulate gastrointestinal physiological functions.
Deng & Shen (2013) note that the NIR component of moxibustion radiation can energize cell metabolism, and that the photoelectric effect and photochemical process can provide activation for pathological cells lacking energy — offering a potential mechanism for how thermal stimulation translates into neurophysiological change.
Safety & Considerations
Moxibustion has a long history of clinical use, and when performed correctly by trained practitioners, it is generally considered safe. However, peer-reviewed research identifies several important safety considerations that patients and practitioners should be aware of.
Effects of moxibustion on the skin can include hotness, flushing, pain, blisters, and other skin irritations and burns phenomena, particularly with direct moxibustion techniques. Moxa can also lead to vasoconstriction at the burning point while causing vasodilation and increased peripheral arterial blood flow and microvascular permeability around it. Appropriate supervision by a trained practitioner is essential to prevent unintended burns.
— Deng & Shen (2013)There is still debate on the safety of moxa smoke. Some reports suggest that moxa smoke may be harmful, such as causing allergic reactions. Mugwort leaf contains terpenes that may produce polycyclic aromatic carcinogens during combustion. However, research examining short-term and long-term exposure found that volatile matter and carbon monoxide generated by moxa smoke under normal operating conditions did not exceed the safety level of standard class II — the established environmental safety standard.
— Deng & Shen (2013)Long-term inhalation of high concentrations of mugwort smoke can cause cardiovascular and respiratory diseases. Animal experiments have shown that long-term inhalation in high concentrations can make rats less sensitive to smell but also lead to lung damage, and high concentrations can lead to the death of mice. These findings underscore the importance of adequate ventilation during treatment and avoiding excessive or prolonged exposure to moxa smoke in clinical settings.
— Ma & Ren (2024)Wang et al. (2025) describe potential risks associated with moxibustion including skin burns, blistering, pruritus, dizziness, and other post-moxibustion discomforts. Their protocol includes systematic adverse event monitoring, with qualified medical professionals required to provide immediate symptomatic treatment for any event, regardless of its perceived relationship to the study. This rigorous safety monitoring framework reflects current best practice for clinical moxibustion research.
— Wang et al. (2025)The Wang et al. (2025) protocol specifies that all practitioners must hold a qualified license in traditional Chinese medicine (TCM) and possess a minimum of 3 years of work experience. Sowmiya et al. (2026) similarly required that all procedures be performed by trained practitioners following routine safety measures to avoid overheating or skin irritation. The level of practitioner training is a critical factor in minimizing adverse events and ensuring appropriate technique.
— Wang et al. (2025); Sowmiya et al. (2026)A unique challenge in moxibustion research — noted explicitly in Wang et al. (2025) — is achieving true blinding for clinical practitioners. Owing to the unique characteristic of moxibustion therapy (the heat and aroma of burning moxa), achieving true blinding for practitioners remains challenging and may introduce potential performance bias. Sham moxibustion controls (8–10 cm above the acupoint, with heat insulation) have been validated in multiple prior studies and are used to address this limitation.
— Wang et al. (2025)Research Limitations
Kim et al. (2011) found that none of the 47 included RCTs received the maximum 5 points on the modified Jadad scale. Seven high-quality studies existed, but only 31 RCTs described randomization methods — and 9 used inappropriate methods such as allocation by treatment order. Power analysis was reported in only one study. These limitations are common in early-phase CAM research and highlight the need for more rigorous future trials.
The 10-year systematic review found no studies comparing moxibustion to a sham control with indistinguishable appearance and no physiological effect. This is a significant methodological gap, as the absence of a true placebo control makes it difficult to separate specific effects of moxibustion from general effects of warmth, attention, and expectation. Wang et al. (2025) acknowledge this directly and employ a validated sham moxibustion design to address it.
Kim et al. (2011) found that 41 of 47 included studies were conducted in China, three in Italy, and three in Korea. The predominance of Chinese studies, which were largely written in Chinese, raises concerns about geographic publication bias and limits generalizability of findings to broader international populations with different healthcare contexts and co-interventions.
Because moxibustion research spans 36 different ICD-10 disease categories, evidence is fragmented across many conditions — with most having only one or two studies. Only ulcerative colitis had sufficient data for a statistically stable meta-analysis in the Kim et al. review. For most other conditions, the findings are preliminary and require larger, more homogeneous trials to confirm or refute initial signals.
Integrative Approaches
Research consistently suggests that moxibustion performs most meaningfully as part of a broader therapeutic strategy — as an adjunct that complements conventional care, acupuncture, or rehabilitation. Its unique combination of thermal, radiation, and pharmacological effects makes it a distinctive complement to other modalities.
Moxibustion and acupuncture share the same meridian and acupoint theory but differ in their mode of action — acupuncture stimulates through physical needle insertion, moxibustion through warmth and chemical effect. The Sowmiya et al. (2026) RCT directly demonstrated that adding moxibustion to a standardized acupuncture protocol produced significantly better outcomes than acupuncture alone across all three measured endpoints (SNOT-22, CRP, ESR) in chronic rhinosinusitis patients.
Combining moxa heat with intermediary materials such as ginger, garlic, or salt creates a pharmacologically enhanced delivery system. Ginger (gingerol) and garlic (allicin) are absorbed transdermally under moxibustion heat, providing additional anti-inflammatory and antimicrobial effects beyond thermal stimulation alone. This approach allows practitioners to tailor treatments to different TCM diagnoses and patient presentations.
Wang et al. (2025) represent the evolving standard for moxibustion research: a multicenter, registered, single-blind RCT with sham controls, validated outcome measures (NRS, ODI, FABQ, SF-36), and neuroimaging via fNIRS. This design allows both clinical efficacy assessment and mechanistic investigation simultaneously — helping to build the translatable evidence base that bridges traditional practice and modern scientific standards.
Research reviewed by Ma & Ren (2024) suggests that moxibustion's effects on the immune system are normalizing rather than uniformly stimulating — meaning it tends to move overexpressed or reduced immune function toward normal range. Combined with its metabolic effects on gastrointestinal tissues (improving metabolic markers and restoring gastrointestinal dynamics), moxibustion may serve as a useful adjunct in conditions where immune regulation and gut health are clinically relevant.
In China, moxibustion is widely adopted within the healthcare system and administered by licensed TCM practitioners alongside conventional medical care. The Wang et al. (2025) trial is being conducted across three tertiary hospitals simultaneously — reflecting institutional integration. In other healthcare systems, moxibustion is increasingly offered in integrative medicine clinics and naturopathic practices as a complementary option for patients who may prefer non-pharmacological approaches.
Laser moxibustion, electrothermal moxibustion, and microwave moxibustion are designed to simulate the traditional therapy's effects while standardizing delivery parameters and reducing smoke exposure. These devices may be particularly appropriate in clinical environments where ventilation is limited or where patients are sensitive to moxa smoke. Research into these modalities is ongoing, with the goal of achieving the precision needed for mechanism isolation and dose-response characterization.
Referenced Literature
All content presented on this page is drawn directly from the following peer-reviewed publications. Claims have not been extrapolated beyond what the studies directly report.