What is IBS?

    Last Updated: May 16, 2025

    Irritable bowel syndrome (IBS) is a common functional disorder of the large intestine that affects aproximately 20% of the global population; it significantly affects quality of life and often co-occurs with anxiety and depression. IBS is more prevalent in women and can be classified into 3 subtypes — diarrhea-predominant, constipation-predominant, or mixed IBS — and postinfectious IBS occurs after gastrointestinal infection.

    IBS is a common functional disorder of the large intestine that affects an estimated 20% of the global population, with a significant negative impact on quality of life and high co-occurrence with anxiety and depression.[1] IBS is twice as common in women compared to men, which could be explained, in part, by genetics and hormonal changes during the menstrual cycle.[2]

    IBS can be classified into three different subtypes: diarrhea-predominant (IBS-D), constipation-predominant (IBS-C), or mixed (IBS-M). If it occurs after a gastrointestinal infection, such as food poisoning, it’s considered post-infectious IBS.[3]

    What is IBS? - Examine