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Delirium and dementia differ mainly in how quickly symptoms appear and how they fluctuate. Delirium comes on suddenly, often over hours to days, and is marked by fluctuating awareness and attention problems—patients may drift in and out of focus and seem easily distractible. This acute, fluctuating cognitive disturbance is usually tied to an underlying medical issue, medications, infection, or metabolic problems in the hospital setting. Dementia, by contrast, is a slow, progressive decline in cognitive abilities—especially memory—developing over months to years, with a relatively stable level of consciousness early on. Because of these distinctions, the statement that delirium is acute and fluctuating with inattention while dementia is chronic and progressive cognitive impairment best captures the difference. The other descriptions mischaracterize delirium’s course or its effects on consciousness and cognition.