IBS is present in 10% to 15% of adults in the US.[4] One study conducted in a health maintenance organisation population showed the prevalence of IBS symptoms in respondents to be 19.5%.[5] The prevalence of IBS is similar in Europe and is lower, but increasing, in the Asia-Pacific region.[6] Reports from Africa vary but prevalence rates as high as 33% have been reported.[6] In the UK, it is estimated that the prevalence is 17% overall, but with a higher prevalence in women (23%) than men (11%).[7][8] 

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