Inflammation comes up constantly in conversations about cancer, recovery, and long-term health — and increasingly, it comes up in conversations about yoga too. It’s a promising area of research, and also one where it’s easy to overstate what’s actually been shown. Here’s what the evidence currently says, and what it doesn’t.
Why Inflammation Matters in Cancer Care
Inflammation is the body’s normal response to injury or threat — useful in short bursts, but a different story when it persists. Chronic, low-grade inflammation has been linked to fatigue, slower recovery, and a range of long-term health effects, and cancer treatment itself can drive certain inflammatory markers up as the body responds to surgery, chemotherapy, radiation and other treatments like immunotherapy, stem-cell transplant.
A 2016 review in Exercise Immunology Review points to several specific biological pathways behind persistent cancer-related fatigue — chronic inflammation, HPA-axis dysfunction, autonomic imbalance, and mitochondrial damage among them — which is part of why movement-based interventions have drawn sustained research interest as a way to intervene on those pathways directly, rather than just manage the symptom. That’s part of why researchers have started asking a more specific question: can a practice like yoga measurably shift those markers, not just how someone feels day to day?
What the Research Says
A 2022 review in Brain, Behavior, & Immunity – Health took stock of the evidence across a wide range of inflammatory markers — C-reactive protein (CRP), the cytokines IL-1β, IL-6, and TNF-α, along with cortisol, telomerase activity, and several other immune indicators. Its conclusion: the evidence is strongest for yoga’s effect on circulating cortisol and the classical inflammatory markers, with growing but less established evidence for the others. The proposed mechanism runs through psychoneuroimmunology — the science of how the mind and immune system communicate — with yoga’s three components (movement, breath, and meditation) working together to reduce stress, which is treated in the review as the common pathway connecting practice to immune response.
Cancer-specific research adds a more targeted data point. A randomized controlled trial followed 96 women with stage II or III breast cancer undergoing chemotherapy and/or radiotherapy, split between standard care alone and standard care plus a long-term yoga practice, with blood drawn at baseline and again at 16, 32, and 48 weeks. The yoga group showed statistically significant decreases in the pro-inflammatory markers IL-1β and IL-10, alongside meaningful improvements in fatigue and functional quality-of-life scores. A companion paper from the same trial, published in Cureus, reports similar reductions in inflammatory cytokines and markers of oxidative stress, paired with improved symptom scores and quality of life across the same patient group.
The Specific Ways Yoga May Support Cortisol and Lower Inflammation
The research above describes an association — yoga practitioners show better markers. What’s more useful is understanding the actual pathways researchers point to for why that might be happening. A few specific mechanisms come up consistently:
- Extended-exhale, diaphragmatic breathing activates the vagus nerve. Breath-led practice — especially an exhale that’s a little longer than the inhale — stimulates the vagus nerve, the nerve largely responsible for shifting the body into its parasympathetic “rest and digest” state. Vagal activation is directly tied to lower circulating cortisol, and it’s the same mechanism behind the Relaxation Response first described by cardiologist Herbert Benson: a measurable, physiological down-shift, not just a subjective sense of calm.
- Meditation appears to calm the body’s central stress-hormone system. The hypothalamic-pituitary-adrenal (HPA) axis is what releases cortisol in response to a perceived threat. Meditation — one of the three components named in the Estevao review — is associated with reduced HPA axis reactivity over time, which is the proposed pathway for why a consistent meditation practice correlates with a lower, more stable baseline cortisol rather than a chronically elevated one.
- Yoga interrupts the chronic stress response that keeps cortisol and inflammation elevated. Acute stress is protective — it mobilizes the immune system to respond to a real threat, then resolves. Chronic stress is where the trouble starts: sustained for months, it keeps cortisol output dysregulated and wears down immune function rather than supporting it. Yoga’s combination of breath, movement, and meditation is theorized to work specifically on that chronic activation pattern, nudging a nervous system stuck “on” back toward a normal, rhythmic cycle.
- Moderate, breath-linked movement supports circulation without adding physical stress. Unlike high-intensity exercise, which can transiently spike inflammatory markers before they settle, gentler, breath-synchronized movement supports blood and lymphatic flow without the same acute stress load on the body — relevant for anyone whose system is already taxed by treatment.
- Lowering inflammation may support mood as much as the reverse. Depression and inflammation reinforce each other in a two-way loop — elevated inflammatory markers can worsen mood, and depressive symptoms in turn prime the body toward larger inflammatory responses to future stressors. Research on anti-inflammatory interventions has found a consistent pattern: the more elevated someone’s baseline inflammation, the larger the mood benefit from bringing it down. It’s a plausible piece of why yoga’s well-documented effect on anxiety and depression in cancer patients may not be purely psychological — it may run partly through this same inflammatory pathway.
- Better sleep may be part of the pathway. Poor sleep is itself a well-established driver of elevated inflammatory markers and disrupted cortisol rhythms. Yoga’s documented benefit for sleep quality is one of the more indirect routes by which a regular practice could support healthier inflammatory and cortisol patterns over time, even without a direct mechanical effect on the markers themselves.
Each of these is a proposed pathway, not a proven one in isolation — and researchers are generally looking at yoga’s three components together (asana, pranayama, meditation) rather than crediting any single piece. But naming the specific mechanisms is what separates an evidence-informed explanation from a vague claim that yoga “reduces stress, which is good for you.“
What This Doesn’t Mean
It would be easy to read those findings and walk away with “yoga reduces inflammation, therefore yoga fights cancer.” That’s not what this research supports, and it’s worth being precise here.
These are correlational findings from a still-developing body of research — biologically plausible, genuinely encouraging, and not yet the basis for definitive clinical claims. It’s also worth separating this from a related but distinct line of research: some biobehavioral scientists have studied whether chronic stress itself can promote tumor-permissive biology through inflammatory pathways and the tumor microenvironment — a 2019 review in Brain, Behavior, and Immunity lays out that mechanistic case. That work is about the general biology of stress and cancer progression, not about yoga, and no yoga trial has tested whether practice changes disease outcomes. Keeping those two bodies of research separate matters — conflating them is exactly the kind of overstatement this piece is trying to avoid.
A 2025 Cochrane review on yoga for cancer-related fatigue reached a similarly measured conclusion about the yoga-specific evidence: indications of benefit are there, but the certainty of the evidence remains limited. That’s not a dismissal — it’s an honest accounting of where the science currently stands, and a reminder that the most robust, well-established evidence for yoga in oncology is still in symptom management, functional outcomes, and quality of life, not disease-modifying claims about inflammation.
What This Means for Your Practice
If you’re practicing yoga during or after cancer treatment, this research is a reason for grounded encouragement, not a reason to expect a specific biological outcome. Yoga remains a supportive practice alongside medical care — not a replacement for it — and its best-documented benefits are still the ones you can feel directly: less fatigue, better sleep, a steadier nervous system, and a better quality of life during a genuinely hard chapter. The inflammation research is a promising thread showing why that might be happening at a biological level, through mechanisms that are increasingly specific and well described. It’s not yet the whole story, and any responsible source teaching Oncology Yoga should treat it that way.
References
- Estevao, C. (2022). The role of yoga in inflammatory markers. Brain, Behavior, & Immunity – Health, 20, 100421.
- Jain, M., Mishra, A., Yadav, V., Shyam, H., Kumar, S., Mishra, S.K., & Ramakant, P. (2023). Long-term yogic intervention decreases serum interleukins IL-10 and IL-1β and improves cancer-related fatigue and functional scale during radiotherapy/chemotherapy in breast cancer patients: a randomized control study. Supportive Care in Cancer.
- Long-Term Yogic Intervention Improves Symptomatic Scale and Quality of Life by Reducing Inflammatory Cytokines and Oxidative Stress in Breast Cancer Patients Undergoing Chemotherapy and/or Radiotherapy: A Randomized Control Study. Cureus (2023).
- Cochrane Database of Systematic Reviews (2025). Yoga for the management of cancer-related fatigue.
- LaVoy, E.C.P., Fagundes, C.P., & Dantzer, R. (2016). Exercise, inflammation, and fatigue in cancer survivors. Exercise Immunology Review, 22, 82–93.
- Kiecolt-Glaser, J.K., Derry, H.M., & Fagundes, C.P. (2015). Inflammation: depression fans the flames and feasts on the heat. American Journal of Psychiatry, 172(11), 1075–1091.
- Seiler, A., Sood, A.K., Jenewein, J., & Fagundes, C.P. (2019). Can stress promote the pathophysiology of brain metastases? A critical review of biobehavioral mechanisms. Brain, Behavior, and Immunity, 87, 860–880.
