Table : TABLE 15.7 • Symptoms Unique and Common to Delirium and Dementia
Unique to deliriumUnique to dementiaCommon to both delirium and dementia
  • Delirium has a rapid onset.
  • Symptoms (including changes in consciousness) fluctuate within a 24-hour period.
  • Hallucinations—frequently visual—are present.
  • Symptoms often gradually improve.
  • The person is not alert and focused.
  • Dementia has a gradual onset.
  • Symptoms typically do not fluctuate within a 24-hour period.
  • Hallucinations are often absent.
  • Symptoms rarely improve.
  • The person is consistently alert.
  • Memory problems.
  • Problems with other types of cognitive functioning.