Body Dysmorphic Disorder
Preoccupation with one or more perceived defects or flaws in physical appearance that are not observable or appear only slight to others, accompanied by repetitive behaviors or mental acts in response.
Body Dysmorphic Disorder vs. Trichotillomania (Hair-Pulling Disorder)
Both are Obsessive-Compulsive and Related Disorders involving repetitive behavior directed at the body, but the underlying driver differs: Body Dysmorphic Disorder's behaviors (checking, camouflaging, grooming) are driven by preoccupation with a perceived appearance flaw, while Trichotillomania's repetitive hair-pulling is a body-focused repetitive behavior typically driven by tension and relief rather than a specific perceived flaw.
Onset / developmental pattern
Body Dysmorphic Disorder often begins in adolescence, frequently tied to a specific perceived flaw; Trichotillomania also commonly begins in childhood or adolescence, often emerging as a habitual, tension-relieving behavior rather than one initially tied to appearance concerns.
Duration / course
Both are chronic conditions without treatment, with symptoms that can wax and wane in intensity over time.
Associated features
Body Dysmorphic Disorder is associated with mirror-checking and reassurance-seeking specifically about the perceived flaw; Trichotillomania is associated with increasing tension before pulling and a sense of relief or gratification afterward, along with noticeable hair loss that can, secondarily, become a source of appearance-related distress or camouflaging behavior.
Functional impairment
Both cause significant functional and social impairment; when hair loss from Trichotillomania becomes severe enough to prompt its own appearance-related preoccupation and camouflaging, the two conditions can appear similar on the surface despite different underlying drivers.
Rule-outs / exclusions
Body Dysmorphic Disorder is not diagnosed when appearance concerns are limited to concern about noticeable hair loss from hair-pulling, which would be better captured as a consequence of Trichotillomania rather than a primary body image disorder, unless a distinct, separate appearance preoccupation is also present.
The differential question
The key differential question is what drives the behavior: is the repetitive behavior aimed at fixing, monitoring, or hiding a perceived appearance flaw (Body Dysmorphic Disorder), or is it a tension-and-relief-driven habitual behavior (hair-pulling) that may only secondarily create an appearance concern (Trichotillomania)?
Common student confusion
When hair loss from Trichotillomania becomes noticeable, a patient may develop camouflaging behaviors resembling Body Dysmorphic Disorder; asking specifically about the sequence -- did concern about appearance come first, or did habitual pulling come first and appearance concern follow as a consequence -- clarifies the primary diagnosis.
Case clues
A patient who is preoccupied with a perceived asymmetry in their face, spending hours checking and trying to camouflage it despite others seeing nothing unusual, fits Body Dysmorphic Disorder; a patient who reports a building urge to pull hair from their scalp, followed by relief after pulling, with resulting bald patches they now try to hide, fits Trichotillomania.
Distinguishing table
| Feature | Body Dysmorphic Disorder | Trichotillomania (Hair-Pulling Disorder) |
|---|---|---|
| Primary driver of behavior | Body Dysmorphic Disorder: preoccupation with a perceived flaw | Trichotillomania: tension and relief from pulling |
| Sequence | Appearance concern typically comes first | Habitual pulling typically comes first; appearance concern may follow |
| Core behavior | Checking, camouflaging, comparing | Recurrent hair-pulling with resulting hair loss |
Clarifying questions to ask
Read each disorder in full
Trichotillomania (Hair-Pulling Disorder)
Recurrent pulling out of one's own hair, resulting in hair loss, with repeated attempts to decrease or stop the behavior.