Glossary

What is IBS (irritable bowel syndrome)?

IBS, or irritable bowel syndrome, is a common, usually long-term condition of the digestive system. It causes repeated tummy cramps, bloating, and bouts of diarrhoea, constipation or both.

Written by Poshan Labs. Sources are named on the page. Last updated 26 October 2026.

IBS: a common, usually long-term condition of the digestive system.

Why IBS matters

IBS isn't dangerous, but it can affect your work, travel, sleep and social life. Symptoms tend to come and go, and often flare with certain foods, stress or rushed meals.

Because other conditions can look similar, see a doctor before deciding it's IBS, especially if you notice:

  • blood in your stool
  • weight loss without trying
  • a sudden change in your bowel habits

Once it's confirmed, diet and lifestyle changes are the main tools, with medicine if needed.

What helps with IBS

The NHS advice comes down to steady habits and a few things to cut back on.

Habits that help:

  • Eat regular meals, without skipping or rushing them.
  • Keep a food and symptom diary to spot your triggers.
  • Drink plenty of water or caffeine-free drinks.

Cut back on:

  • fatty, spicy and processed food
  • too many cups of tea or coffee
  • alcohol and fizzy drinks

Other things that help:

  • Oats and other soluble fibre, if you're constipated.
  • Testing cabbage, cauliflower, onions and beans one at a time, since some people react to them, rather than cutting everything out.
  • Regular exercise and ways to relax, which help many people.

A dietitian can guide you if you find you're avoiding lots of foods.

The first call is free

Tell Puja what's going on and she will tell you honestly whether she can help.

A question about IBS (irritable bowel syndrome)?

Send Puja a message. On a free call she looks at your reports and your plate with you, and says what to change.