Hoarding is a disorder that may be present on its own or as a symptom of another disorder. Those most often associated with hoarding are obsessive-compulsive personality disorder (OCPD), obsessive-compulsive disorder (OCD), attention-deficit/hyperactivity disorder (ADHD), and depression.
Although less often, hoarding may be associated with an eating disorder, pica (eating non-food materials), Prader-Willi syndrome (a genetic disorder), psychosis, or dementia.