Pain is, at its core, a signal of inflammation. Understanding how the immune system generates that inflammation — and how alcohol use specifically adds fuel to the fire — makes it easier to understand how inflammation contributes to chronic pain, and what might help resolve that inflammation.
How the Immune System Creates Inflammation
When toll-like receptors on the surface of cells detect patterns associated with a microbe, they trigger the release of inflammatory cytokines — IL-1, IL-6, and TNF-α — which signal the hypothalamus to raise body temperature and also produce the classic signs of inflammation: swelling, redness, pain, and general sickness behavior. These cells also release chemokines like IL-8 to attract neutrophils to the area.
Mast cells get activated either directly by bacteria or by these chemokine signals. Once mast cells and basophils are activated, they release histamine and serotonin. Histamine causes vasodilation — the cells lining the capillaries pull farther apart — which allows histamine and chemokines to enter the bloodstream.
Neutrophils, which normally sit stationary along the capillary wall, respond by moving toward the highest chemokine concentration until adhesion molecules stop them. Then they squeeze out of the capillary to phagocytose bacteria and damaged cells. Dendritic cells do similar work, phagocytosing bacteria and presenting the resulting antigens, while B cells and T cells also make their way out of the capillaries to join the response. The fluid that leaves the capillaries during this process — exudate — is directly responsible for the redness and swelling associated with inflammation.
Macrophages also phagocytose bacteria, and then fuse the phagosome with a lysosome, which produces reactive oxygen species to help destroy the microbe. That oxidative stress in turn triggers the release of even more pro-inflammatory cytokines (IL-1, IL-6, and TNF-α). Notably, food isn’t exempt from this same machinery: a Th1 hypersensitivity response to a particular food can generate inflammation through the same reactive oxygen species pathway, triggered when IgG antibodies crosslink on macrophages.
Alcohol’s Contribution to Inflammation
Alcohol use is associated with elevated levels of several of these same cytokines — TNF-α, IL-1β, IL-6, and IL-8. Alcohol use can increase intestinal permeability, and once that barrier is compromised, endotoxins can pass into the bloodstream and trigger an immune response that produces still more TNF-α.
Pattern recognition receptors on innate immune cells detect lipopolysaccharides and peptidoglycans from bacteria, as well as damage-associated molecular patterns released by injury. Once activated, these immune cells communicate with each other and ramp up cytokine production further. High TNF-α causes intestinal epithelial cells to shed at a faster rate, which makes it harder for tight junctions to stay properly adhered, since the neighboring cell they’d normally attach to is gone — widening the gaps and increasing intestinal permeability even further.
On top of this gut-driven cascade, the metabolism of ethanol generates additional oxidative stress. And because ethanol crosses the blood-brain barrier, immune cells within the brain end up producing inflammatory cytokines too.
How Systemic Inflammation Contributes to Chronic Pain
Pain is a signal of inflammation, and injuries are one obvious source of it — the immune system responding directly to signs of tissue damage. But when signals indicating unwanted microbes are present at the same time, that inflammation compounds. You feel the pain at the site of injury, but it’s more intense because it reflects both the local inflammation from the injury and systemic inflammation converging in the same place.
Bacteria (or fragments of bacteria) crossing the intestinal wall into the bloodstream is a common contributor to that systemic load. Normally only a very small amount crosses through, but increased intestinal permeability lets more through than the body is designed to handle easily. And that permeability can be driven by multiple factors at once: inflammation increases intestinal permeability, as does inadequate vegetable and fiber intake — and even a small amount of alcohol can damage the intestines, taking roughly 2–3 weeks to fully heal.
Natural Approaches to Reducing Inflammation
A few evidence-backed options worth considering as part of an anti-inflammatory approach:
- Boswellia — shown to have anti-inflammatory effects and may help relieve pain (Majeed et al., 2024).
- Ginger — also demonstrated anti-inflammatory effects (Mozaffari-Khosravi et al., 2016).
- Probiotic (Lactobacillus rhamnosus GG) — anti-inflammatory, and may help reduce the amount of bacterial lipopolysaccharide circulating in the bloodstream (Moludi et al., 2022).
- Inulin — a prebiotic that can help improve the effectiveness of a probiotic regimen.
- Berries and other polyphenol-rich fruits — their polyphenol content is associated with reduced inflammation (Hairul Hisham et al., 2025).
- Dark chocolate — its flavonoid content is anti-inflammatory (Behzadi et al., 2024). Milk chocolate doesn’t offer the same benefit, since its higher sugar content is pro-inflammatory.
A Note on Alcohol and Healing
Reducing or eliminating alcohol can be helpful in resolving inflammation. It’s worth setting realistic expectations, though: during withdrawal, inflammation typically doesn’t disappear right away — it often takes time, in line with the intestinal healing process, before pain and inflammation start to improve. Anyone who drinks heavily or regularly should talk to a doctor before stopping or cutting back significantly, since alcohol withdrawal can carry real medical risks and may need to be managed safely under medical supervision.
The content of this blog is for educational purposes and is not intended as medical advice. Please work with a qualified healthcare provider for personalized guidance, especially regarding alcohol use, withdrawal, and any new supplement.
References
Behzadi, M., Bideshki, M. V., Ahmadi-Khorram, M., Zarezadeh, M., & Hatami, A. (2024). Effect of dark chocolate/cocoa consumption on oxidative stress and inflammation in adults: A GRADE-assessed systematic review and dose-response meta-analysis of controlled trials. Complementary Therapies in Medicine, 84.
Hairul Hisham, H. I., Lim, S. M., Neoh, C. F., Abdul Majeed, A. B., Shahar, S., & Ramasamy, K. (2025). Effects of non-pharmacological interventions on gut microbiota and intestinal permeability in older adults: A systematic review. Archives of Gerontology and Geriatrics, 128, 105640.
Majeed, A., Majeed, S., Satish, G., Manjunatha, R., Rabbani, S. N., Patil, N. V. P., & Mundkur, L. (2024). A standardized Boswellia serrata extract shows improvements in knee osteoarthritis within five days — a double-blind, randomized, three-arm, parallel-group, multi-center, placebo-controlled trial. Frontiers in Pharmacology, 1–17.
Moludi, J., Khedmatgozar, H., Nachvak, S. M., Abdollahzad, H., Moradinazar, M., & Sadeghpour Tabaei, A. (2022). The effects of co-administration of probiotics and prebiotics on chronic inflammation, and depression symptoms in patients with coronary artery diseases: A randomized clinical trial. Nutritional Neuroscience, 25(8), 1659–1668.
Mozaffari-Khosravi, H., Naderi, Z., Dehghan, A., Nadjarzadeh, A., & Fallah Huseini, H. (2016). Effect of ginger supplementation on proinflammatory cytokines in older patients with osteoarthritis: Outcomes of a randomized controlled clinical trial. Journal of Nutrition in Gerontology and Geriatrics, 35(3), 209–218.
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