Sudden confusion (delirium) can have many different causes. Get medical help immediately if someone suddenly becomes confused (delirious).
If a person is confused, they may:
Try asking the person their name, their age and today's date. If they seem unsure or can't answer you, they probably need medical help.
It could be a sign of dementia. The symptoms of dementia often start gradually and get worse over time.
Many of the causes of sudden confusion need assessment and treatment as soon as possible. In some cases, it may be life threatening.
Sudden confusion can be caused by many different things. Don't try to self-diagnose – get medical help if someone suddenly becomes confused or delirious.
Some of the most common causes of sudden confusion include: