What is IBS? Symptoms, Causes, and Treatment Options Explained

What is Irritable Bowel Syndrome (IBS)?

Irritable bowel syndrome (IBS) is a common digestive condition affecting around 2 in 10 people in the UK. While occasional stomach discomfort is normal, IBS causes recurring abdominal pain, bloating, and changes in bowel habits such as diarrhoea or constipation.

Though there is no cure (despite many people searching for an IBS cure or how to cure IBS), IBS symptoms can often be managed effectively through diet, lifestyle changes, and medications, including IBS medication and other IBS treatment options.

What are the symptoms of IBS?

The main symptom of IBS is abdominal pain, often experienced as cramps in the lower left side of the stomach. Many people find this discomfort improves after going to the toilet.

Other common symptoms include:

 

 Symptom 

 What you might notice 

 Bloating 

A feeling of fullness or swelling in the abdomen. 

 Diarrhoea 

Frequent or urgent bowel movements. 

 Constipation

Difficulty emptying the bowels completely. 

Flatulence 

Passing wind more often than usual. 

Mucus in stools 

Noticing mucus in your stool, which can happen when the gut lining is irritated.

Indigestion or nausea 

A feeling of sickness or discomfort after eating. 

Tiredness or backache 

General fatigue or lower back discomfort that can accompany IBS flare-ups. 

Irritable bladder symptoms or incontinence 

Needing to urinate more often or urgently, sometimes with leakage.  content

What causes IBS?

The exact cause of IBS isn’t fully understood. However, possible factors include:

  • Sensitive bowel nerves or muscles that react more strongly to certain stimuli

  • Genetics: A family history of IBS increases your likelihood of developing it

  • Alcohol, caffeine, and fizzy

  • Processed foods, fatty or spicy meals

  • Stress and anxiety

  • Certain antibiotics

Identifying and avoiding your triggers is key to managing IBS. Keeping a symptoms diary can help pinpoint what causes flare-ups.

Person sitting outdoors holding their stomach, marked as a featured article

How is IBS diagnosed?

IBS can be difficult to diagnose because its symptoms overlap with other conditions like inflammatory bowel disease (IBD) or coeliac disease.

Your clinician will start by discussing your symptoms, their frequency, and duration. To rule out other conditions, they may recommend:

  • Blood tests
  • Stool sample tests

If other conditions are excluded and your symptoms match IBS, a diagnosis can be confirmed.

Man holding both hands on his stomach, seated outdoors

How is IBS treated?

Managing IBS often starts with lifestyle changes, tailored to your specific symptoms. Here’s how you can take control — whether that means IBS relief, IBS relief tablets, or the right medication for IBS:

  • Diet Adjustments:

    • Reduce fatty, spicy, or processed foods

    • Increase fresh, homemade meals

    • Monitor fibre intake—high-fibre foods may help constipation but worsen diarrhoea

  • Exercise & Hydration:

    • Regular physical activity can improve symptoms

    • Drink plenty of water and reduce caffeine, fizzy drinks, and alcohol

  • Over-the-Counter Medicines:

    • For cramps and bloating: Buscopan or peppermint oil

    • For diarrhoea: Loperamide (e.g., Imodium)

    • For constipation: Laxatives

If lifestyle changes and over-the-counter medicines aren’t enough — whether you’ve already tried treatment for IBS, are wondering how to treat IBS, or are checking current IBS treatment UK guidance, consult a clinician.

When to See a Doctor or Advanced Clinical Practitioner (ACP)

You should seek medical advice if:

  • You struggle to manage symptoms despite making lifestyle changes

  • You experience severe pain or symptoms like blood in stools, unexplained weight loss, or ongoing diarrhoea

  • IBS is significantly affecting your mental health or quality of life

Woman eating a forkful of food outdoors

Frequently asked questions

Here are direct answers to some of the most frequently asked questions about IBS.

IBS is classed as a functional bowel disorder, meaning the gut looks structurally normal but doesn’t work quite as it should. Many people with IBS have visceral sensitivity — their gut nerves are more responsive to stress than usual, so the gut-brain axis can become dysregulated. This means your gut may signal and respond to normal digestion in an exaggerated way, increase sensitivity to stretching or gas, while motility-related changes affect how quickly things move through your system.

IBS is often subtyped based on your main symptom pattern. IBS-D is diarrhoea-predominant, IBS-C is constipation-predominant, and IBS-M (mixed-type) involves alternating between the two. Symptoms are frequently postprandial, meaning they flare after eating, and can be stress-induced — which is why IBS is sometimes wrongly dismissed as purely psychosomatic, when it’s a genuine physical condition with a strong gut-brain component.

Diet plays a major role for many people with IBS. A low FODMAP diet temporarily cuts out fermentable oligosaccharide, disaccharide, monosaccharide and polyol foods — the ones most likely to ferment in the gut and trigger symptoms — before gradually reintroducing them to identify your personal triggers. Getting the right balance of dietary fibre matters too: soluble fibre tends to be better tolerated than insoluble fibre if you’re dietary-sensitive, though everyone’s tolerance is different.

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