HD is a persistent difficulty discarding or parting with possessions because of a perceived need to save them. A person with hoarding disorder experiences distress at the thought of getting rid of the items. Excessive accumulation of items, regardless of actual value, occurs.
Body Dysmorphic Disorder(BDD)
BDD is a mental disorder in which you can't stop thinking about one or more perceived defects or flaws in your appearance — a flaw that, to others, is either minor or not observable.
Body-Focused Repetitive Behaviour(BFRB)
BFRB are an interrelated set of disorders categorized by “self-grooming” routines that include trichotillomania (compulsive hair pulling), dermatillomania (compulsive skin picking, also called excoriation disorder), and onychophagia (compulsive nail biting)—have been theorized to be related to anxiety disorders, impulse control disorders, and obsessive compulsive disorder. But most experts agree that they differ significantly from all three.
Olfactory Reference Syndrome (ORS)
ORS is an underrecognized and often severe condition that has similarities to obsessive-compulsive disorder (OCD) and body dysmorphic disorder (BDD). People with ORS think they smell bad, but in reality they don't. There's a profound mismatch between their own perception and the perception of other people.