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A rigid, false system of beliefs which a person firmly holds and is preoccupied with despite strong evidence to the contrary. Delusional beliefs are often centered around notions of persecution or grandeur.

Delusions are fixed beliefs do not change, even when a person is presented with conflicting evidence. Delusions are considered “bizarre” if they are clearly implausible and peers within the same culture cannot understand them. An example of a bizarre delusion is when an individual believes that his or her organs have been replaced with someone else’s without leaving any wounds or scars. An example of a non-bizarre delusion is the belief that one is under police surveillance, despite a lack of evidence.

Delusional disorder refers to a condition in which an individual displays one or more delusions for one month or longer. Delusional disorder is distinct from schizophrenia and cannot be diagnosed if a person meets the criteria for schizophrenia. If a person has delusional disorder, functioning is generally not impaired and behavior is not obviously odd, with the exception of the delusion. Delusions may seem believable at face value, and patients may appear normal as long as an outsider does not touch upon their delusional themes. Also, these delusions are not due to a medical condition or substance abuse.

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