Types of ibs

What are the different types of IBS?

There are several different types of IBS, along with additional underlying diagnoses. Not all doctors use or are even aware of the various diagnostic categories, so don’t be alarmed if your doctor has diagnosed you with “just” IBS. However, it’s good to know which category you fall into, as the advice for the different groups varies slightly.

If you haven’t consulted a doctor about your symptoms, it’s always a good idea to do so first. Here, you can learn more about the different types of IBS and which foods are better to choose. Most people, regardless of their IBS type, generally improve with a FODMAP diet, but beyond that, there are some foods that are better suited to different conditions.

IBS-C: Constipation-predominant IBS

IBS-C (C for constipation) is characterized by constipation that can last anywhere from a few days to over a week. Symptoms of IBS-C include regular issues with:

  • Irregular bowel movements (less than every third day)
  • Lumpy or hard stool (types #1 or #2 on the Bristol Stool Chart)
  • Straining during bowel movements


Have you been advised to eat more fiber? This is common advice given during doctor visits, sometimes along with a prescription for bulk-forming laxatives. It can help, but not for everyone, and not all types of fiber work. The key is to choose the right kind of fiber to avoid worsening constipation. The FODMAP diet helps you learn which types of fiber are good for your gut.

IBS-D: Diarrhoea-predominant IBS

 IBS-D (D for diarrhea) is characterized by loose or watery stools and the following symptoms:

  • Frequent trips to the bathroom
  • Loose or watery stools (types #5, #6, or #7 on the Bristol Stool Chart)
  • The urge to urgently go to the bathroom


Having IBS-D means that your intestines are working faster than usual, which means food passes through more quickly. In some cases, water and nutrients don’t have enough time to be absorbed, leading to nutrient deficiencies. You might also see undigested food in your stool. You may simply notice bits of food in the toilet. Since increased transit time means that your intestines are working faster, you might benefit from avoiding stimulants like coffee, alcohol, and nicotine. Try eliminating them for a period to see how they affect your symptoms. If you feel better, you can try reintroducing them in small amounts.

IBS-M, a mix of the different types?

Most people have a dominant type of stool most of the time, but it’s not uncommon to be constipated for a period and then experience diarrhea. This likely means you have IBS-M. There are also those whose IBS symptoms change over time, shifting from constipation to looser stools. Anyone who has ever been nervous or stressed knows that it speeds up digestion.

By keeping a food and symptom diary, you can more easily get an overview of your bowel habits and see which category you might fall into. Since there are different types of IBS, you may need a modified treatment, and it’s helpful to seek support from a dietitian or participate in Belly Balances digital IBS treatment.

Sofia Antonsson
Reg. Dietitian,
Belly Balance

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