| http://www.w3.org/ns/prov#value | - The population prevalence in community surveys varies between 5% and 20% depending on the criteria used to define its presence,1- 5 and the condition is more common in female and younger individuals.2,6- 8 The natural history often follows a chronic relapsing-remitting course.9- 11 Affected individuals report symptoms such as lower abdominal pain, diarrhea, and abdominal bloating or distention.12
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