DRG Epidemiology's coverage of irritable bowel syndrome comprises epidemiological estimates of key patient populations across 45 countries worldwide. We report the prevalence of irritable bowel syndrome for each country as well as annualized case counts projected to the national population.

Most patient populations are forecast over a period of 20 years for the major mature pharmaceutical markets of the United States, Europe, and Japan and 10 years for the other countries covered in this report.

DRG Epidemiology's irritable bowel syndrome forecast will answer the following questions:

  • How will demographic trends, such as population aging and improving life expectancy, affect the epidemiology of irritable bowel syndrome over the forecast period?

All forecast data are available on the DRG Insights Platform in tabular format, with options to download to MS Excel. All populations are accompanied by a comprehensive description of the methods and data sources used, with hyperlinks to external sources. A summary evidence table generated as part of our systematic review of the epidemiological literature is also provided for full transparency into research and methods.

In addition to the total number of cases for each forecast year, DRG Epidemiology provides at least ten years of forecast data for the following irritable bowel syndrome subpopulations:

  • IBS prevalent cases by predominant symptom status.

Note: Coverage may vary by country.

Table of contents

  • Irritable Bowel Syndrome - Epidemiology - Emerging Markets
    • Introduction
      • Prevalence of Irritable Bowel Syndrome per 100 Among Those Aged 20 or Older in 2018 and 2028
      • Relative Sizes of the Contributing Factors to the Trend in Prevalent Cases of Irritable Bowel Syndrome Over the Next Ten Years
      • Analysis of the Prevalent Cases of Irritable Bowel Syndrome in 2018 by IBS Subtypes
    • Epidemiology Data
    • Methods
      • Total Prevalent Cases
      • IBS Subtypes
    • Reference Materials
      • Literature Review
        • Studies Included in the Analysis of Irritable Bowel Syndrome
        • Studies Excluded from the Analysis of Irritable Bowel Syndrome
      • Risk/Protective Factors
        • Risk/Protective Factors for Irritable Bowel Syndrome
      • Bibliography

    Author(s): Shilpa Thakur; Abey John, MPH

    Shilpa Thakur is a medical graduate with a M.P.H from the Postgraduate Institute of Medical Education and Research with a specialization in epidemiology and biostatistics. She specializes in developing epidemiological forecasts for the multiple indications within the DRG syndicated portfolio.

    Prior to joining Decision Resources, she monitored HIV sentinel surveillance 2016-2017 in Himachal Pradesh. She also has worked on to see the patterns of Antimicrobial resistance in India.


    Abey John is a medical graduate with a Master’s in Public Health and has been associated with DRG since September 2015. He works with a global team of epidemiologists in performing systematic reviews of assigned diseases and prepare forecast models for clients. He also is involved in producing analyses for pharmaceutical drug developers on the descriptive epidemiology of major drug indications in mature and developing markets and have an overall experience of three years working in different healthcare sectors across the country.

    Prior to joining DRG, Abey had been working with Jhpiego (an affiliate of Johns Hopkins Medical University) in implementing Family Planning Health Programs in India with collaborating with the Government of India. He also has worked with a grassroots level NGO as a health team manager which worked for the benefit of the rural population living in the foothills of the Himalayas.