Understanding IBS
IBS affects 1 in 7 people and is one of the most misunderstood gut conditions. Here's what it actually means, what causes it, and what you can do about it.
Irritable bowel syndrome (IBS) is a chronic gut condition that affects how your digestive system works. It's not a disease in the traditional sense — there's no inflammation, no structural damage, nothing that shows up on a scan. Which is partly why it's so frustrating to be diagnosed with.
You feel genuinely terrible. Your scans come back clear. Your doctor says you have IBS. And then... not much happens.
If that's your experience, this guide is for you. Let's go through what IBS actually is, what causes it, and — most importantly — what you can realistically do about it.
The honest answer is: we don't fully know. IBS is thought to involve a combination of factors, and the relative importance of each varies from person to person:
Gut-brain communication problems — the signals between your gut and nervous system are misfiring, making your gut hypersensitive to normal digestive activity. What most people feel as gentle pressure, someone with IBS feels as significant pain.
Altered gut motility — things move too fast (IBS-D), too slow (IBS-C), or unpredictably (IBS-M). This affects stool consistency, urgency, and frequency.
Gut microbiome imbalances — the balance of bacteria in your digestive tract may be disrupted, affecting fermentation, immune signalling, and neurotransmitter production.
Post-infectious changes — IBS often develops after a bout of gastroenteritis or food poisoning. Post-infectious IBS is thought to involve lasting changes to gut sensitivity and microbiome composition.
Stress and the gut-brain axis — not as "the cause," but as a real physiological factor. Stress changes gut motility, increases gut permeability, and lowers the pain threshold in the gut.
IBS is now classified as a "disorder of gut-brain interaction" (DGBI) — a term that replaced the older "functional bowel disorder." This shift reflects the understanding that IBS involves real physiological dysfunction in the communication between gut and brain, not just psychological symptoms.
IBS is classified by your predominant bowel pattern:
Many people find their subtype shifts over time. IBS-D can become IBS-M, or a period of constipation follows months of diarrhoea. This adds to the confusion and unpredictability of the condition.
IBS is diagnosed clinically — meaning through your symptom history, not just by ruling out other conditions. The Rome IV criteria (the current diagnostic standard) define IBS as recurrent abdominal pain occurring at least one day per week in the last three months, associated with two or more of:
Your doctor will also rule out "red flag" symptoms that could indicate more serious conditions.
Some symptoms warrant urgent investigation rather than an IBS assumption. See your doctor promptly if you have blood in your stool, unintentional weight loss, symptoms that wake you at night, fever alongside gut symptoms, or new symptoms in someone over 50. These are red flags that need investigation before attributing symptoms to IBS.
Before an IBS diagnosis, your doctor may want to rule out:
Food doesn't cause IBS, but it's one of the most reliable triggers for symptoms. The problem is that food triggers vary enormously between individuals. What wrecks one person's gut has no effect on another's.
The foods most commonly associated with IBS symptoms include:
The only reliable way to identify your specific triggers is to track what you eat alongside your symptoms — consistently, over enough time to see patterns.
There's no cure for IBS, but most people can significantly reduce their symptoms through a combination of approaches:
The tracking step is where most people get stuck — because doing it properly requires consistency over weeks, and without a structured system, most people give up or end up with data that doesn't tell them anything useful.
Before starting any dietary intervention, get tested for coeliac disease. Coeliac tests require you to be actively consuming gluten — if you remove wheat first, the test becomes unreliable. Get the test, then adjust your diet based on results.
One of the most underacknowledged aspects of IBS is its impact on quality of life. It affects work (difficulty concentrating during flares, anxiety about being far from a bathroom), social life (stress around eating out, travelling, attending events), and mental health (the cumulative toll of chronic symptoms and uncertainty).
Taking IBS seriously — not dismissing it as "just a sensitive stomach" — is the first step to getting better. Most people who commit to systematic identification and management of their triggers see significant, lasting improvement.
Log meals and symptoms by voice or text. AI spots trigger patterns — including delayed reactions you'd miss on your own.
Start Tracking Free →IBS is a real physiological condition involving abnormal gut-brain communication, altered gut motility, and often food triggers. It's diagnosed clinically and managed through a combination of dietary identification, stress management, and in some cases medication. Most people can significantly reduce their symptoms — but it takes systematic investigation, starting with identifying your specific triggers.
This article is for informational purposes and is not medical advice. Talk to your doctor before making dietary changes.
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