Delusional disorder
Delusional disorder is a mental disorder marked by one or more persistent delusions, without the broader pattern of symptoms typical of schizophrenia.
Delusion: A fixed belief that persists despite strong evidence against it and is not ordinarily accepted within the person’s cultural context. Persistent delusions are the defining feature of this disorder.
Reality testing: The ability to distinguish internal thoughts and perceptions from externally verifiable reality. Delusions involve persistent conclusions that conflict with shared evidence.
Obsessive-compulsive disorder: A disorder involving intrusive obsessions and repetitive behaviors or mental acts intended to reduce distress. Obsessions are usually experienced differently from delusions, though insight can vary.
Psychiatric assessment: A clinical evaluation of mental symptoms, history, functioning, risks, and possible causes. Assessment establishes the belief’s course and checks for alternative explanations.
Erotomanic delusion: A delusion that another person, often of higher status, is in love with the individual. This is a named delusional theme that can define a presentation.
Delusional disorder diagnostic criteria: The diagnostic requirements used to identify delusional disorder and distinguish it from other conditions. These criteria specify duration, functioning, and exclusions that shape diagnosis.
Cultural formulation: A clinical approach to understanding how culture shapes the meaning and expression of distress. Cultural context helps clinicians avoid labeling shared beliefs as delusions.
Body dysmorphic disorder: A disorder involving distressing preoccupation with perceived flaws in appearance that others see as minor or absent. Appearance beliefs may be delusional in intensity but belong to a distinct diagnosis.
Differential diagnosis: The process of distinguishing among conditions that can explain a person’s symptoms. Delusions can arise from psychiatric, neurological, medical, or substance-related causes.
Jealous delusion: A delusion that a romantic partner is unfaithful, despite inadequate supporting evidence. The belief centers on suspected infidelity rather than persecution or grandiosity.