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The International Classification of Diseases classifies delusional disorder as a mental and behavioural disorder. [15] Diagnosis of a specific type of delusional disorder can sometimes be made based on the content of the delusions, to wit, the Diagnostic and Statistical Manual of Mental Disorders (DSM) enumerates seven types:
A delusion [a] is a false fixed belief that is not amenable to change in light of conflicting evidence. [2] As a pathology, it is distinct from a belief based on false or incomplete information, confabulation, dogma, illusion, hallucination, or some other misleading effects of perception, as individuals with those beliefs are able to change or readjust their beliefs upon reviewing the evidence.
While non-delusional grandiose beliefs are somewhat common—occurring in at least 10% of the general population [3] —and often [vague] positively influence a person's self-esteem, in some cases they may cause a person distress, in which case such beliefs may be clinically evaluated and diagnosed as a psychiatric disorder.
Capgras delusion or Capgras syndrome is a psychiatric disorder in which a person holds a delusion that a friend, spouse, parent, other close family member, or pet has been replaced by an identical impostor. [a] It is named after Joseph Capgras (1873–1950), the French psychiatrist who first described the disorder.
This condition is often seen in disorders like schizophrenia, schizoaffective disorder, delusional disorder, manic episodes of bipolar disorder, psychotic depression, and some personality disorders. [2] [3] Alongside delusional jealousy, persecutory delusion is the most common type of delusion in males and is a frequent symptom of psychosis.
Folie à deux (French for 'madness of two'), [1] also called shared psychosis [3] or shared delusional disorder (SDD), is a rare psychiatric syndrome in which symptoms of a delusional belief [4] are "transmitted" from one individual to another.
Delusional misidentification syndrome is an umbrella term, introduced by Christodoulou (in his book The Delusional Misidentification Syndromes, Karger, Basel, 1986) for a group of four delusional disorders that occur in the context of mental and neurological illness.
Ravindran (1999) developed a list of criteria for the diagnosis of paraphrenia, which agrees with much of the research done up to the time it was published. 1. A delusional disorder of at least six months duration characterized by the following: a. Preoccupation with one or more semisystematized delusions, often accompanied by auditory ...