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In page Delirium:

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*Other mental illnesses: Some mental illnesses, such as a manic episode of bipolar disorder, depersonalization disorder, or some types of acute psychosis may cause a rapidly fluctuating impairment of cognitive function and ability to focus. These, however, are not technically causes of delirium per DSM-V criteria D (i.e. fluctuating cognitive symptoms occurring as part of a primary mental disorder are results of the said mental disorder itself), while physical disorders (e.g. infections, hypoxia, etc.) can precipitate delirium as a mental side-effect/symptom.