Step 1: Conceptual Grasp:
The inquiry concerns the categorization of Body Dysmorphic Disorder (BDD) within the DSM-5. BDD is defined by an excessive preoccupation with a perceived physical defect that is either undetectable or negligible to others.
Step 2: Elaborated Clarification:
In the prior DSM-IV, BDD was classified under "Somatoform Disorders" due to its focus on bodily concerns. However, accumulating research underscored BDD's pronounced obsessive-compulsive characteristics, exemplified by intrusive thoughts about the perceived flaw and compulsive actions such as excessive mirror-gazing, skin manipulation, or grooming rituals. Acknowledging this significant overlap, the developers of the DSM-5 integrated BDD into the newly established "OCD and related disorders" chapter, alongside conditions like Obsessive-Compulsive Disorder and Hoarding Disorder.
Step 3: Definitive Conclusion:
The DSM-5 positions Body Dysmorphic Disorder within the chapter dedicated to OCD and related disorders.