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In this article, theoretical conceptualizations of OCD and IAD and their comorbid presentation are outlined, and assessment and differential diagnosis of these conditions are discussed. Despite shared cognitive vulnerabilities and behavioral patterns, well-validated symptom measures, along with careful functional analysis, can be used to distinguish between OCD, IAD, and comorbid presentations. Best practices for the cognitive-behavioral treatment of these co-occurring conditions are also presented, with suggestions based on both the empirical literature and detailed case studies. Finally, recommendations for future research on co-occurring OCD and IAD and their treatment are explored.<\/jats:p>","DOI":"10.1891\/jcp-2022-0027","type":"journal-article","created":{"date-parts":[[2022,8,24]],"date-time":"2022-08-24T18:16:09Z","timestamp":1661364969000},"page":"327-340","source":"Crossref","is-referenced-by-count":4,"title":["Obsessive-Compulsive Disorder and Illness Anxiety: Examining Commonalities and Comorbidity"],"prefix":"10.1891","volume":"36","author":[{"given":"Kelly A.","family":"Knowles","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kavi S.","family":"Jakes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bunmi O.","family":"Olatunji","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"793","published-online":{"date-parts":[[2022,8,24]]},"reference":[{"issue":"4","key":"2023011208400638000_36.4.327.1","doi-asserted-by":"crossref","first-page":"211","DOI":"10.1080\/10401230500295339","article-title":"Hypochondriasis: Conceptualization, treatment, and relationship to obsessive compulsive disorder","volume":"17","year":"2005","journal-title":"Annals of Clinical Psychiatry"},{"key":"2023011208400638000_36.4.327.2","doi-asserted-by":"publisher","DOI":"10.1016\/j.psc.2006.02.008"},{"key":"2023011208400638000_36.4.327.3","doi-asserted-by":"publisher","DOI":"10.1007\/s10608-006-9058-1"},{"key":"2023011208400638000_36.4.327.4","doi-asserted-by":"publisher","DOI":"10.1037\/a0018260"},{"key":"2023011208400638000_36.4.327.5","doi-asserted-by":"publisher","DOI":"10.1016\/j.beth.2006.05.001"},{"key":"2023011208400638000_36.4.327.6","doi-asserted-by":"crossref","unstructured":"American Psychiatric Association. 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