Hoarding Disorder
This chapter discusses the nature and clinical characteristics of hoarding disorder, a debilitating condition that runs a chronic course without treatment and can lead to significant functional impairment and cost to society. Prevalence estimates for hoarding disorder range from 1.5% to 6% of the general population, and it tends to co-occur with depressive and anxiety disorders. In the DSM-5, hoarding disorder was differentiated from obsessive-compulsive disorder, primarily because of the pronounced differences from OCD in terms of treatment response and phenotype. However, HD remains classified as an obsessive-compulsive and related disorder. This chapter covers the etiology of hoarding disorder across biological and psychological determinants. In addition to the nature of symptoms, contemporary approaches to assessment and treatment are highlighted. The chapter concludes with a discussion of future directions for research.