Summary
Chronic inflammation is a prolonged, low-grade inflammatory process that persists outside of acute infection or injury, contributing to the development of chronic disease.[1][4]
It’s less about a one-time spike in inflammatory signals and more about a breakdown in how the immune response is regulated. When chronic inflammation persists over time, it can raise the risk of chronic disease and accelerate aging.[1][2]
Modern science understands a great deal about what causes chronic inflammation — and that knowledge can be used to lower inflammatory burden and support long-term health.
Key facts
• Chronic inflammation isn’t an acute process — it’s a long-lasting state.
• It often has no obvious symptoms, but it can raise the risk of chronic disease and speed up age-related changes.
• The main drivers are diet, body weight, physical activity level, sleep, C and stress.
• Not all inflammation is harmful: acute inflammation is a normal protective response.
• The goal isn’t to “eliminate inflammation” — it’s to control it.
What it is
In other words, chronic inflammation is a state in which inflammatory signals stay active longer than they need to.
Inflammatory factors are substances released in the body that signal to cells that something is wrong and needs a response. They are also called inflammation markers or mediators. They include, for example, cytokines such as interleukin-6 (IL-6), tumor necrosis factor (TNF), and others.
Inflammation can be acute or chronic. Acute inflammation is meant to protect us. After an injury or infection, for example, it helps contain the damage, limit the spread of infection, and kick off healing. Chronic inflammation differs from acute inflammation in that it often isn’t accompanied by the classic signs (pain, heat, redness) — yet it can last for years.[1][4]
The inflammatory process can drag on. This is not always tied to a lingering illness — it can also become a self-sustaining process in its own right. In that case, inflammation weakens but never fully switches off.
That raises a question: how can chronic inflammation start — and sustain itself — on its own?
Causes of chronic inflammation
Chronic inflammation develops under the influence of several groups of factors.
Metabolic factors
• excess fat tissue;
• insulin resistance;
• disrupted lipid and glucose metabolism;
• gut microbiota imbalances.
Lifestyle factors
• a low-fiber diet;
• too many ultra-processed foods (including fast food);
• low physical activity;
• chronic stress;
• insufficient sleep.
External factors
• air pollution;
• smoking;
• toxic substances;
• certain occupational and environmental exposures.
How exactly do these factors lead to chronic inflammation?
The inflammatory mediators mentioned above are produced in the body, and the amount produced can go up or down. Certain factors drive that level higher.
Fat tissue, for example, is not just an energy reserve — it can also be a source of inflammatory signals. That is why excess visceral fat is linked to higher levels of chronic inflammation.[1]
Diet matters too. Too much omega-6 fatty acid intake, too little fiber, and various toxins (such as nitrosamines and trans fats) all drive inflammatory factors higher. Stress and insufficient sleep are also linked to changes in inflammation markers.[1][3]
There is a lot of talk today about the gut microbiota — the bacteria and other microorganisms that live there. The microbiota has a direct effect on chronic inflammation. When its composition becomes less diverse (for example, due to antibiotics), certain bacterial species can overgrow, which ultimately weakens the gut barrier and lets bacterial toxins leak into the bloodstream.[1] This triggers a low-grade but persistent inflammatory response that underlies many common diseases — from metabolic syndrome to autoimmune and neurodegenerative disorders (multiple sclerosis, Alzheimer’s disease, and others).
Insulin resistance (reduced sensitivity to insulin) is another interesting example. It is itself caused by chronic inflammation, but at the same time it is also one of its causes.
It’s important to understand: this usually isn’t about a single cause, but a combination of factors.
Why chronic inflammation is dangerous
Think of chronic inflammation like a small match left burning on the ground. It doesn’t cause a big fire right away. But it can start one if there’s something nearby that catches fire easily. Chronic inflammation works the same way. It makes it more likely that a person will get sick with diseases they were already at risk for.
Current research links chronic inflammation to a range of conditions, including:
• autoimmune diseases;
• cardiovascular disease, hypertension;
• type 2 diabetes;
• neurodegenerative processes;
• autism;
• cancer.
In essence, chronic inflammation is the underlying foundation inside chronic diseases that helps sustain them.
Important: a link doesn’t always mean direct causation. In many chronic diseases, inflammation is one of several processes that sustain tissue damage and disease progression.[1]
How to tell if you have chronic inflammation
Chronic inflammation often has no specific symptoms. It can develop gradually, so people do not always notice the changes right away.
Signs that may point to an elevated inflammatory background include:
• chronic fatigue;
• sleep problems;
• weight gain;
• frequent infections;
• a general sense of low energy;
• feeling worse overall for no obvious reason.
Important: these signs are non-specific and can be linked to many different conditions. They cannot be used to make a diagnosis on their own.
Chronic inflammation often accompanies various chronic diseases and age-related changes. That is why it is sometimes viewed as one of the factors linking lifestyle, metabolism, the immune system, and aging.
What this means in practice
It’s important to understand that chronic inflammation is not a standalone disease — it is a background process.
This means that:
• it cannot be “felt” directly;
• it cannot be “cured” quickly;
• it cannot be assessed with a single universal test;
• it requires a long-term approach.
The goal is not to eliminate inflammation completely, but to control it.
Can chronic inflammation be measured?
Chronic inflammation can be assessed using laboratory tests. Inflammation markers are usually what is measured.
The most commonly used are:
• C-reactive protein (measured with a high-sensitivity assay);
• interleukin-6;
• other cytokines and immunological markers
It is important that such tests are done outside of any acute condition: without a cold or viral illness, a flare-up of a chronic disease, an injury, or another clear cause of acute inflammation.
If tests are taken during an infection, the result will mainly reflect acute inflammation rather than the underlying chronic inflammatory background.
That said, no single marker fully captures chronic inflammation. It is always an indirect estimate.
Learn more: Chronic inflammation calculator based on hs-CRP (currently available in Russian)
What to do
Chronic inflammation can be managed. On this portal we write extensively about how to fight chronic inflammation. The main contribution usually comes not from a single product or supplement, but from overall lifestyle.
Reducing chronic inflammation is mainly linked to factors such as:
• a diet with adequate fiber;
• regular physical activity;
• normalized sleep;
• stress management;
• weight control;
• limiting exposure to toxins, including smoking and air pollution.
A diet with enough vegetables, fruit, legumes, and whole grains, for example, can support a healthier inflammatory profile.
Important: the effect of supplements and individual nutrients is usually smaller than that of basic lifestyle factors.
Along the way, it matters to understand what actually influences chronic inflammation and how strong the underlying evidence is. That is exactly what this portal is dedicated to.
Conclusion
Chronic inflammation is not a standalone disease — it is a background process that influences the development of many conditions.
Addressing it is not a short-term task, but a long-term strategy tied to lifestyle.
Managing chronic inflammation matters for two reasons. First, it lowers the odds of developing chronic disease and helps preserve physical function and a healthy appearance. Second, if a disease is already present, it can ease its course alongside treatment prescribed by a doctor.
Sources
- Furman D., Campisi J., Verdin E., et al. Chronic inflammation in the etiology of disease across the life span. Nature Medicine. 2019;25:1822–1832. DOI: 10.1038/s41591-019-0675-0.
- Xia Li, Chentao Li, Wanying Zhang, et al. Inflammation and aging: signaling pathways and intervention therapies. Signal Transduction and Targeted Therapy. 2023;239. DOI: 10.1038/s41392-023-01502-8.
- Vijendra A., Kunkle C., Jordan J., et al. Molecular connections between inflammation and social determinants of health. Frontiers in Epidemiology. 2025;5:1683955. DOI: 10.3389/fepid.2025.1683955.
- Arutyunov G.P., Glinkina V.V., Larina V.N., et al. What Is Chronic Low-Grade Inflammation? A Consensus Statement on a Teaching Strategy for Theoretical and Clinical Departments [in Russian]. Lechebnoe Delo. 2025;(1):56–67. DOI: 10.24412/2071-5315-2025-13265.