Delirium

Delirium is a serious disturbance in mental abilities that results in confused thinking and reduced awareness of the environment. The start of delirium is usually rapid — within hours or a few days

Delirium can often be traced to one or more contributing factors, such as a severe or chronic illness, changes in metabolic balance (such as low sodium), medication, infection, surgery, or alcohol or drug intoxication or withdrawal.

Poor thinking skills (cognitive impairment)

This may appear as:

  • Poor memory, particularly of recent events
  • Disorientation — for example, not knowing where you are or who you are
  • Difficulty speaking or recalling words
  • Rambling or nonsense speech
  • Trouble understanding speech
  • Difficulty reading or writing

Behavior changes

These may include:

  • Seeing things that don’t exist (hallucinations)
  • Restlessness, agitation or combative behavior
  • Calling out, moaning or making other sounds
  • Being quiet and withdrawn — especially in older adults
  • Slowed movement or lethargy
  • Disturbed sleep habits
  • Reversal of night-day sleep-wake cycle

Emotional disturbances

These may appear as:

  • Anxiety, fear or paranoia
  • Depression
  • Irritability or anger
  • A sense of feeling elated (euphoria)
  • Apathy
  • Rapid and unpredictable mood shifts
  • Personality changes

https://www.mayoclinic.org/diseases-conditions/delirium/symptoms-causes/syc-20371386

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