Delusional disorder is categorized as one of the Schizophrenia Spectrum and Other Psychotic Disorders in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5). Its major characteristic is the presence of delusions, which are fixed beliefs that are not amenable to change in light of conflicting evidence. Unlike in schizophrenia, in delusional disorder functioning is not markedly impaired, thought process is usually uncompromised, hallucinations are mostly absent, and the behavior of patients is not obviously bizarre or odd. In other words, these patients seem quite healthy at first sight, except for the presence of a fixed delusional system, which might severely strain their marital or other significant relationships and even lead to dangerous or criminal activity and hospitalization. Patients mostly do not have ...

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