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Confusion (from Latinconfusĭo, -ōnis, noun of action from confundere "to pour together", or "to mingle together" also "to confuse") is the state of being bewildered or unclear in one’s mind about something.
Confusion may result from a relatively sudden brain dysfunction. Acute confusion is often called delirium (also called acute confusional state), although delirium also includes a much broader array of disorders than confusion (e.g. inability to focus attention; and various impairments in awareness, or temporal and spatial orientation).
Confusion may also result from chronic organic brain pathologies such as dementia.