It has long been theorized that Obsessive-Compulsive Disorder (OCD) and Compulsive Buying Disorder (CBD) may share important characteristics, increasing the likelihood of the cooccurrence of these two psychiatric disorders. On the other hand, Hoarding Disorder (HD) were originally conceptualized to exist only within the context of OCD, despite hoarding symptoms presenting in less than 5% of OCD cases.

This study aims to provide an overview of impulsive-compulsive spectrum, regarding the similarities and differential diagnosis between compulsive buying and hoarding.

The authors performed a non-systematic literature review, using PubMed search terms “compulsive buying”, “hoarding” and “obsessive-compulsive spectrum”.

Obsessive-compulsive spectrum disorders are a group of similar psychiatric disorders characterized by repetitive thoughts, distressing emotions and compulsive behaviors. Compulsive buying is defined by a preoccupation with buying and shopping, by frequent buying episodes or overpowering urges to buy that are experienced as irresistible and senseless. These episodes are accompanied by relief and pleasure, but followed by remorse and guilt. A sub‐group compulsively hoard the items they have bought. Hoarding disorder is characterized by persistent difficulty discarding items regardless of value, urges to save items and distress associated with discarding, and the accumulation of possessions which compromise use of the home.

Empirical evidence suggests that both OCD and CBD display high levels of impulsivity and compulsivity. However, given the phenomenology, CB may not fit well in OCD related disorders. It may be also misleading to classify HD as part of OCD, since hoarding has the lowest specificity and predictive criteria for OCD.

No significant relationships.

Hierarchical structural models of psychopathology rarely extend to obsessive-compulsive spectrum disorders. The current study sought to examine the higher-order structure of the obsessive-compulsive and related disorders (OCRDs) in DSM-5: obsessive-compulsive disorder (OCD), hoarding disorder (HD), body dysmorphic disorder (BDD), trichotillomania (hair-pulling disorder; HPD) and excoriation (skin-picking) disorder (SPD).

Adult patients in a partial hospital program (N = 532) completed a dimensional measure of the five OCRDs. We used confirmatory factor analysis to identify the optimal model of the comorbidity structure. We then examined the associations between the transdiagnostic factors and internalizing and externalizing symptoms (i.e. depression, generalized anxiety, neuroticism, and drug/alcohol cravings).

The best fitting model included two correlated higher-order factors: an obsessions-compulsions (OC) factor (OCD, BDD, and HD), and a body-focused repetitive behavior (BFRB) factor (HPD and SPD). The OC factor, not the BFRB factor, had unique associations with internalizing symptoms (standardized effects = 0.42–0.66) and the BFRB factor, not the OC factor, had small marginally significant unique association with drug/alcohol cravings (standardized effect = 0.22, p = 0.088).

The results mirror findings from twin research and indicate that OCD, BDD, and HD share liability that is significantly associated with internalizing symptoms, but this liability may be relatively less important for BFRBs. Further research is needed to better examine the associations between BFRBs and addictive disorders.