The published literature on olfactory reference syndrome (ORS) spans more than a century and provides consistent descriptions of its clinical features. The core symptom is preoccupation with the belief that one emits a foul or offensive body odor, which is not perceived by others. This syndrome is associated with substantial distress and disability. DSM-IV and ICD-10 do not explicitly mention ORS, but note convictions about emitting a foul body odor in their description of delusional disorder, somatic type. However, the fact that such symptoms can be nondelusional poses a diagnostic conundrum. Indeed, DSM-IV also mentions fears about the offensiveness of one's body odor in the social phobia text (as a symptom of taijin kyofusho). There also seems to be phenomenological overlap with body dysmorphic disorder, obsessive-compulsive disorder, and hypochondriasis. This article provides a focused review of the literature to address issues for DSM-V, including whether ORS should continue to be mentioned as an example of another disorder or should be included as a separate diagnosis. We present a number of options and preliminary recommendations for consideration for DSM-V. Because research is still very limited, it is unclear how ORS should best be classified. Nonetheless, classifying ORS as a type of delusional disorder seems problematic. Given this syndrome's consistent clinical description across cultures for more than a century, substantial morbidity and a small but growing research literature, we make the preliminary recommendation that ORS be included in DSM-Vs Appendix of Criteria Sets Provided for Further Study, and we suggest diagnostic criteria.
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