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Background  The diagnosis of functional somatic syndromes (FSS) requires 1) presence of somatic symptoms, and 2) absence of medical conditions potentially accounting for these symptoms. Due to the limited feasibility of medical examinations, epidemiological research on FSS has neglected to assess the second criterion. Our objective was therefore to evaluate the implications of considering information on exclusionary medical conditions in epidemiological research on FSS.    Methods  A survey among 3’054 students was conducted. We compared prevalence rates and overlap of 17 FSS obtained by: 1) a  symptom-based strategy  and 2) a  symptom-and-exclusion-based strategy  including information on exclusionary medical conditions.    Results  The  symptom-and-exclusion-based strategy  led to a marked decrease in prevalence rates compared to the  symptom-based strategy . Furthermore, it resulted in fewer individuals who were affected by multiple FSS.    Conclusions  Adding self-reported information on exclusionary medical conditions leads to a significant decrease in the prevalence and overlap of FSS. More rigorous approaches to studying FSS should be adopted.

Functional somatic syndromes: asking about exclusionary medical conditions results in decreased prevalence and overlap rates