--- title: "Chronic Inflammation Explained: How the Response That Heals a Cut Turns Against You When It Never Switches Off" description: "Chronic inflammation explained: how it differs from acute inflammation, the diseases it drives, the signs to look for and the habits that keep it running." author: Dr Marina Nani (Editor-in-Chief) date: 2026-11-10T14:00:00.034Z updated: 2026-11-11T16:16:01.576Z canonical: https://richhealthmagazine.com/article/chronic-inflammation-explained image: https://cdn.nanimediahouse.com/pexels-9788779.webp categories: Health, Longevity & Science content_type: Guide publication: Rich Health Magazine schema_type: Article --- A paper cut turns red, warm and slightly swollen within minutes. That is inflammation doing its job, and within a few days the cut has healed and the redness has gone. The same defence system can also stay switched on at a low level for months or years, with no redness, no pain and no obvious warning. Doctors call this chronic low-grade inflammation, and scientists now link inflammation-related diseases such as heart disease, stroke, cancer, type 2 diabetes, kidney disease and fatty liver disease to more than half of all deaths worldwide. The habits that keep it switched on can also switch it off. Once you understand how chronic inflammation works, you can spot the signs, find the triggers in your own life and change the ones that matter most. ## What Inflammation Is and Why Your Body Needs It Inflammation is your immune system's emergency response. When you cut your finger or catch a cold, damaged cells and invading microbes release chemical alarm signals. Nearby blood vessels widen and become leakier, which lets fluid and white blood cells flood the area. The extra blood flow makes the spot red and hot, the fluid makes it swell, and the chemical signals make it sore. The first cells to arrive are neutrophils, which attack bacteria and clear away debris. Larger cells called macrophages follow to finish the clean-up and start the repair. Once the threat has gone, your body releases a second set of signals that shut the response down, and the tissue heals. Without this process, a small graze could turn into a dangerous infection. ## Acute vs Chronic Inflammation Acute inflammation is short, loud and useful. Chronic low-grade inflammation is long, faint and harmful. The two use many of the same cells and chemical messengers, but they behave in very different ways. - **How long it lasts:** acute inflammation lasts hours to days, while chronic inflammation runs for months or years. - **What you notice:** acute inflammation brings redness, heat, swelling and pain, while chronic inflammation often brings nothing more than tiredness, aches or a thickening waist. - **Where it acts:** acute inflammation stays at the injury, while chronic inflammation spreads through your bloodstream and reaches every organ. - **How it ends:** acute inflammation ends in repair, while chronic inflammation slowly damages tissue and can leave scarring behind. Chronic inflammation starts in one of two ways. Sometimes the trigger never goes away, as with smoking, a diet high in ultra-processed food or a slow infection in your gums. Sometimes the shut-down signals fail, so your immune system keeps sending out inflammatory messengers such as interleukin-6 and tumour necrosis factor long after the job is done. Autoimmune diseases such as rheumatoid arthritis, Crohn's disease and psoriasis are also forms of chronic inflammation, and they need specialist medical care. The low-grade, body-wide kind is different: everyday habits switch it on and off, which puts much of it within your control. ## How Chronic Inflammation Damages Your Heart, Blood Sugar and Brain Low-grade inflammation works slowly, and it affects almost every system in your body. **Heart and arteries.** Inflammation helps fatty plaques build up inside your artery walls and makes them more likely to rupture, which is the event behind most heart attacks and strokes. In a large trial of more than 10,000 people who had already had a heart attack, a drug that lowered inflammation without changing cholesterol cut further heart attacks, strokes and cardiovascular deaths by about 15%. That result showed inflammation is a cause of heart disease, not just a sign of it. **Blood sugar and weight.** Inflammatory messengers interfere with the way your muscles, liver and fat cells respond to insulin. Your pancreas then has to make more insulin to keep your blood sugar steady, and over time this insulin resistance can lead to type 2 diabetes. Fat stored deep around your organs releases its own inflammatory messengers, so weight gain and inflammation feed each other. **Liver and kidneys.** Chronic inflammation is closely tied to fatty liver disease and to chronic kidney disease, two conditions that often develop for years before you notice anything wrong. **Mood and memory.** Inflammatory messengers can affect your brain. About a quarter of people with depression show signs of low-grade inflammation in their blood, and more than half have mildly raised levels. In a study that followed more than 12,000 middle-aged adults for 20 years, those with the highest inflammation levels at the start had a steeper decline in memory and thinking skills over the following two decades. **Muscles and bones.** Long-term inflammation is linked to faster loss of muscle and bone with age, which raises your risk of frailty and fractures. ## What Is Inflammaging? Inflammaging is the slow rise in background inflammation that comes with age. As you get older, your immune cells clear away damaged and worn-out cells less efficiently. Some of those ageing cells stay in your tissues and release inflammatory signals of their own. Your gut lining also becomes leakier, which lets fragments of bacteria slip into your bloodstream and keep your immune system on alert. Age raises the baseline for everyone, but your daily habits can push it higher or help hold it down. Two people of the same age can have very different inflammation levels, and the difference often comes down to how they eat, sleep, move and handle stress. ## What Keeps Chronic Inflammation Switched On Researchers have identified a group of [everyday factors that keep low-grade inflammation running](https://richhealthmagazine.com/article/what-causes-chronic-inflammation). Most of them are things you can change. - **Diet:** a diet high in ultra-processed food, sugar, refined starch and processed meat, and low in vegetables, fruit, pulses and whole grains. - **Belly fat:** fat stored deep around your organs, which behaves like an organ that makes inflammatory messengers. - **Sitting still:** long hours without movement. - **Poor sleep:** regularly sleeping less than seven hours, or sleeping badly. - **Chronic stress and loneliness:** long periods of pressure, worry or social isolation. - **Smoking and heavy drinking:** both irritate tissues and disturb your gut bacteria. - **Hidden infections:** gum disease in particular. - **Pollution:** air pollution and some chemicals in your home and workplace. - **An imbalanced gut:** too few of the bacteria that help keep your immune system calm. Each of them adds to the same load, and each one you change takes some of that load away. ## Symptoms of Chronic Inflammation in the Body Chronic inflammation often gives no clear symptoms at all, which is why so many people only find out about it when a related disease appears. When it does show itself, the signs are easy to blame on a busy life: tiredness that sleep does not fix, aching joints and muscles, digestive trouble, skin flare-ups, frequent colds, low mood, brain fog and a waistline that keeps growing. A simple blood test for C-reactive protein, a protein your liver makes when inflammation is present, can show whether your levels are raised. The high-sensitivity version picks up the low levels that matter for heart health. Persistent symptoms can also point to other conditions, so speak to your GP if any of these signs last for more than a few weeks. ## Simple Ways to Start Lowering Inflammation This Week You do not have to change everything at once. These four steps act on several triggers at the same time, and each one takes only a few minutes a day. **Fill half your plate with plants.** At lunch and dinner, make vegetables, salad, pulses or fruit cover half the plate. Their fibre feeds the gut bacteria that produce calming compounds, and their colourful plant chemicals help neutralise the damage inflammation causes. Our guide to the [foods to eat and the foods to limit](https://richhealthmagazine.com/article/inflammation-prevention-diet-10-foods-to-eat-and-5-to-limit) gives you a full shopping list. **Walk for ten minutes after your largest meal.** Working muscles pull sugar out of your blood, which softens the spike that follows a meal. Read more about [how short walks improve your blood sugar and mood](https://richhealthmagazine.com/article/small-walks-big-wins-how-ten-minutes-or-less-can-improve-your-mood-blood-sugar-and-energy). **Protect seven hours of sleep.** A run of short nights raises inflammatory markers in your blood. Set a fixed time to switch off screens and keep it on weekdays and weekends alike. **Swap one processed snack a day.** Replace crisps, biscuits or a sugary bar with a handful of walnuts or almonds, a piece of fruit or a spoonful of olive oil drizzled over vegetables. If stress is a big part of your day, our guide to [calming your nervous system in minutes](https://richhealthmagazine.com/article/how-to-calm-your-nervous-system-7-fast-techniques) gives you techniques you can use between meetings. For a wider view of how prevention habits support one another, read [our holistic approach to prevention](https://richhealthmagazine.com/article/holistic-health-prevention). [Learn the signs of chronic inflammation](https://richhealthmagazine.com/article/signs-of-chronic-inflammation-crp-blood-test) and the blood test that measures it, and you can catch it while small changes still make a big difference. ## Frequently Asked Questions **Q: What is the difference between acute and chronic inflammation?** Acute inflammation is the short, visible response to an injury or infection. It brings redness, heat, swelling and pain, lasts hours to days and ends once the tissue has healed. Chronic inflammation is a low-level response that continues for months or years, often without obvious symptoms, and slowly damages tissues such as blood vessel walls, joints and organs. **Q: What are the symptoms of chronic inflammation in the body?** Chronic inflammation often has no clear symptoms. When signs do appear, they can include ongoing fatigue, joint and muscle aches, digestive problems, skin flare-ups, frequent infections, low mood, brain fog and weight gain around the middle. A blood test for C-reactive protein can show whether inflammation is raised. Anyone with symptoms that last more than a few weeks should see a GP, as the same signs can have other causes. **Q: What is inflammaging?** Inflammaging is the gradual rise in background inflammation that happens with age. It occurs as the immune system becomes less efficient at clearing damaged cells, ageing cells release inflammatory signals and the gut lining becomes more permeable. Inflammaging is linked to heart disease, type 2 diabetes, frailty and memory decline, and diet, exercise, sleep and stress all influence how fast it progresses. **Q: Does inflammation cause depression?** Inflammation does not cause every case of depression, but the two are closely linked. Around a quarter of people with depression have signs of low-grade inflammation in their blood, and inflammatory messengers can affect brain chemistry, mood and motivation. Researchers are testing whether lowering inflammation helps people with depression who have raised inflammatory markers. Anyone experiencing depression should speak to a GP. --- *This article is for general information only and is not medical advice. It does not replace a diagnosis, treatment or advice from your GP or another qualified health professional. Speak to your doctor before you make changes to your diet, exercise, medication or supplements, especially if you have a medical condition, are pregnant or breastfeeding, or take regular medication.*