---
title: "What Causes Chronic Inflammation: The Everyday Habits That Keep Your Immune System on Alert"
description: The everyday habits that cause chronic inflammation, how each one keeps your immune system on alert, a self-check for each and the first change to make.
author: Dr Marina Nani (Editor-in-Chief)
date: 2026-11-11T16:11:48.028Z
updated: 2026-11-11T16:11:48.044Z
canonical: https://richhealthmagazine.com/article/what-causes-chronic-inflammation
image: https://cdn.nanimediahouse.com/pexels-36713413.webp
categories: Health, Longevity & Science
content_type: Guide
publication: Rich Health Magazine
schema_type: Article
---

Nobody catches chronic inflammation the way you catch a cold. It builds from ordinary days: the sandwich eaten at the desk, the fourth coffee in place of a walk, the email answered at midnight, the glass of wine that becomes two. Each habit sends a small alarm signal to your immune system. On its own, the signal fades within hours. Repeated day after day, the signals keep your defences switched on long after any real threat has gone.

That build-up is why chronic inflammation so often has no single cause. It is a total, and every habit below adds to it or takes away from it. How many of them are part of your week?

## Everyday Causes of Chronic Inflammation

**Ultra-processed food.** Packaged snacks, ready meals, processed meat, sweetened cereals and fizzy drinks are built from refined starch, sugar, cheap oils, salt and additives, with little fibre left in them. Your body digests them fast, and the rush of sugar and fat into your blood after each meal sets off a burst of inflammatory signalling. In a survey of more than 9,000 adults, the people who took most of their daily calories from ultra-processed food were more likely to have raised levels of C-reactive protein, the main blood marker of inflammation, than the people who ate the least.

*Self-check:* more than half of what you ate yesterday came out of a packet.

*First change:* cook one extra meal a week from fresh ingredients, even something as simple as an omelette with spinach and tomatoes.

**Sugar and refined starch.** White bread, white pasta, pastries, sweets and sugary drinks send your blood sugar up sharply and then down again. Each spike triggers chemical stress inside the cells that line your blood vessels, and the cells respond with inflammatory messengers. Regular spikes also push your liver to turn the excess sugar into fat, and a fatty liver is itself a source of inflammation.

*Self-check:* you feel sleepy or hungry again within two hours of a meal.

*First change:* swap one white staple a day for its wholegrain version, and eat the vegetables and protein on your plate before the bread or pasta.

**Too little fibre.** The bacteria in your gut ferment fibre into short-chain fatty acids, compounds that feed the cells of your gut lining and calm the immune cells beneath it. Without enough fibre, those helpful bacteria shrink in number, the lining weakens and fragments of bacteria slip through into your blood, where your immune system treats them as a threat. UK adults are advised to eat 30g of fibre a day, yet the average adult eats around 16g, and only about 4 in 100 reach the target.

*Self-check:* you eat fewer than five portions of vegetables, fruit and pulses on most days.

*First change:* add a tin of beans, lentils or chickpeas to two meals this week.

**Belly fat.** Fat stored deep around your organs behaves differently from the fat on your hips. As those fat cells swell, parts of the tissue run short of oxygen and some cells die. Immune cells move in to clear the damage and release inflammatory messengers that travel straight to your liver and on around your body.

*Self-check:* your waist measures more than half your height. Our guide to the [signs of chronic inflammation and the blood test that measures it](https://richhealthmagazine.com/article/signs-of-chronic-inflammation-crp-blood-test) shows you how to measure it properly.

*First change:* losing even a small amount of weight from your middle lowers inflammatory markers, so start with the habits below rather than a crash diet.

**Long hours of sitting.** Working muscles release their own messenger proteins, and several of them calm inflammation. When you sit for hours, those muscles fall idle, and the sugar and fat from your last meal stay in your blood for longer.

*Self-check:* you regularly sit for more than an hour without getting up.

*First change:* stand up and move for two or three minutes every half hour, and walk for ten minutes after your largest 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).

**Short or broken sleep.** Sleep is when your immune system resets. After a single night of partial sleep loss, your immune cells produce more of the inflammatory messengers interleukin-6 and tumour necrosis factor the following morning, and the genes that drive inflammation switch on. Weeks of short nights keep that response running.

*Self-check:* you sleep less than seven hours on most nights, or wake unrefreshed.

*First change:* fix your wake-up time, seven days a week, and count back seven and a half hours to set your bedtime.

**Chronic stress.** Short bursts of stress hormones damp inflammation down. When stress runs for weeks, your immune cells stop responding to cortisol's braking signal, and the fight-or-flight nerves keep switching on inflammatory genes inside them.

*Self-check:* you find it hard to switch off in the evening, or you feel tense before the working day begins.

*First change:* take three minutes of slow breathing, in for four counts and out for six, before your first meeting and again before bed. Our guide to [calming your nervous system in minutes](https://richhealthmagazine.com/article/how-to-calm-your-nervous-system-7-fast-techniques) gives you more techniques.

**Loneliness.** Feeling cut off from other people raises inflammation, and lonely people's immune cells show more activity in the genes that drive it. Your body reads isolation as a form of danger and prepares for injury that never comes.

*Self-check:* you go most days without a real conversation with someone who matters to you.

*First change:* put one call, coffee or walk with a friend in your diary each week and treat it like any other appointment.

**Smoking.** Tobacco smoke irritates your airways and damages the lining of your blood vessels, and smokers carry higher levels of inflammatory markers than non-smokers. Those levels start to fall once you stop.

*Self-check:* you smoke, even occasionally.

*First change:* contact your local NHS stop smoking service. You are far more likely to quit with its support than on willpower alone.

**Heavy drinking.** Alcohol damages the lining of your gut and lets fragments of bacteria pass into the blood that flows to your liver. Your liver reacts with inflammation, and heavy drinking over years can scar it. UK guidance is to drink no more than 14 units a week, spread over three or more days, with several drink-free days.

*Self-check:* you drink more than 14 units in a typical week, or you rarely have a day without a drink.

*First change:* choose two drink-free days each week and keep them fixed.

**Gum disease.** Bacteria living in inflamed pockets around your teeth leak into your bloodstream every time you chew or brush. Your liver answers with C-reactive protein, and treating gum disease lowers it.

*Self-check:* your gums bleed when you brush or floss.

*First change:* clean between your teeth every day with floss or interdental brushes, and book a check-up with your dentist or hygienist.

**Air pollution.** The fine particles in traffic fumes are small enough to travel deep into your lungs, and some pass into your bloodstream. Your immune system reacts to them as it would to any foreign body.

*Self-check:* you walk, run or cycle along busy roads most days.

*First change:* choose back streets and parks for your walk or run, and open a window or use an extractor fan when you cook.

## How to Find Your Own Triggers

Go back through the twelve self-checks and count how many describe you. Then choose two of them: the one that applies to you most strongly and the one you could change most easily. Start with the easy one this week. An early success builds the confidence to tackle the harder habit next.

A two-week diary helps you see the pattern. Each evening, note what you ate and drank, how long you slept, how much you moved and how stressed you felt, and score your energy, aches and digestion from one to five. Within a fortnight you will often see which habits leave you stiff, bloated or foggy the next day.

## How Inflammation Triggers Feed Each Other

A short night raises the hunger hormone ghrelin and lowers leptin, the hormone that signals you have eaten enough, so you reach for sugar the next day. Stress makes a drink at the end of the day feel necessary. Belly fat makes snoring and broken sleep more likely, and broken sleep makes the stress harder to carry. Each loop keeps the others turning.

The same loops work in reverse. An earlier night makes the walk after lunch easier. The walk lowers your blood sugar, steadier blood sugar softens the cravings, and fewer cravings mean less belly fat over time. Change one habit and you loosen several of the others with it.

## Your Immune System's Off-Switch

Your immune system still has its off-switch. The same response that healed your last paper cut and then switched off is still working inside you, held on alert by signals you send it every day. Each meal built on plants, each early night, each walk after dinner and each honest conversation with a friend sends it the signal that the danger has passed. Choose the trigger you can change this week, and let your body finish the job it started.

## Frequently Asked Questions

**Q: What causes chronic inflammation in the body?**
Chronic inflammation usually builds from several everyday factors at once. The most common are a diet high in ultra-processed food, sugar and refined starch, too little fibre, excess belly fat, long hours of sitting, short or poor sleep, chronic stress, loneliness, smoking, heavy drinking, gum disease and air pollution. Autoimmune conditions and long-lasting infections can also cause it. Each factor sends alarm signals to the immune system, and together they keep it switched on at a low level for months or years.

**Q: Does sugar cause inflammation in the body?**
Regular large amounts of sugar and refined starch can raise inflammation. Sharp rises in blood sugar after a meal trigger chemical stress in the cells lining blood vessels, which release inflammatory messengers in response. Excess sugar also pushes the liver to store fat, and a fatty liver adds to inflammation. Diets high in sugary drinks and refined carbohydrates are linked to higher levels of C-reactive protein, a blood marker of inflammation.

**Q: How do I know if I have chronic inflammation?**
Chronic inflammation often causes no obvious symptoms, so a blood test is the most reliable check. A high-sensitivity C-reactive protein (hs-CRP) test measures low levels of inflammation, and a result above 3 mg/L suggests it is raised. A GP can advise whether the test is right for you and read the result alongside other health markers.

**Q: What are the signs of chronic inflammation?**
Common signs include tiredness that sleep does not fix, aching joints and muscles, bloating and other digestive problems, skin flare-ups, low mood, brain fog, frequent colds, bleeding gums and weight gain around the middle. Many of these signs have other causes too, so anyone with symptoms that last more than a few weeks should see a GP.

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*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.*