What is a defining characteristic of Delusional Disorder?

A defining characteristic of Delusional Disorder is the presence of delusions that persist for at least one month. This criterion is essential to differentiate Delusional Disorder from other psychotic disorders, as individuals with this condition primarily experience a fixed belief or set of beliefs that are not based in reality. Unlike other disorders where hallucinations, significant mood disturbances, or catatonic behavior may play prominent roles, Delusional Disorder is primarily defined by the nature and duration of the delusions themselves.

The requirement for delusions to last at least one month is crucial because it establishes that the beliefs have a sustained quality, indicating a significant departure from normal cognition, which is a core feature of the disorder. The focus on delusions rather than the presence of other symptoms allows for a clearer diagnosis, as delusions can occur in a variety of mental health conditions, but in Delusional Disorder, they stand as the primary symptom without major mood or functional impairment associated with them.