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Delusions are fixed, false beliefs that are inconsistent with reality, are inconsistent with cultural beliefs, and cannot be changed with reasoning. Delusions can be found in several different disorders, including, but not limited to, schizophrenia, schizoaffective disorder, bipolar disorder, major depressive disorder, and delusional disorder. They can also be present in medical conditions such as delirium, with the use of substances and with toxin exposure.

In its simplest form, one can be diagnosed with delusional disorder. This consists of the presence of a delusion, which can be bizarre or nonbizarre, for at least 1 month without loss of functioning. Bizarre delusions refer to beliefs that cannot be true or are not understandable, whereas nonbizarre delusions refer to false beliefs that could be true and are understandable, ...

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