A nurse is caring for a client who has obsessive-compulsive disorder. Which of the following comorbidities should the nurse anticipate when reviewing the client's medical record?

Choice A reason: While trauma can coexist with many mental health issues, post-traumatic stress disorder (PTSD) is not the most specifically linked comorbidity for OCD in general clinical screening. PTSD involves a distinct pathology related to trauma exposure, whereas OCD centers on an internal cycle of intrusive thoughts and neutralizing ritualistic behaviors. Choice B reason: Agoraphobia involves an intense fear of environments where escape might be difficult, often linked to panic disorder. While an OCD patient might avoid certain places due to contamination fears, agoraphobia is a distinct anxiety disorder and is not the primary comorbid condition typically anticipated for an OCD diagnosis. Choice C reason: Research indicates a high rate of comorbidity between obsessive-compulsive disorder and eating disorders, particularly anorexia nervosa. Both conditions share underlying personality traits such as perfectionism, rigidity, and the use of ritualistic behaviors to manage intense anxiety, making this a common finding when reviewing the medical records of these clients. Choice D reason: Delusional disorder involves fixed false beliefs without the other symptoms of schizophrenia. Although severe OCD can sometimes involve poor insight bordering on delusional thinking, it is categorized separately. Most OCD patients retain some level of awareness that their obsessions are irrational, which distinguishes the condition from a primary delusional disorder.