Delirium (also known as Acute Confusion)

What Is Delirium?

Delirium is when someone suddenly becomes very confused. It can happen quickly—over hours or days. People might not know where they are, what time it is, or who they’re with. They may act strangely or see things that aren’t there.

What Causes Delirium?

Delirium can be caused by many things, such as:

• Being very sick

• Having an infection

• Taking new medicine

• Not eating or drinking enough

• Being in pain

• Not sleeping well

• Being in a new place, like a hospital

Signs to Look For

Someone with delirium might:

• Seem more confused than usual

• Be sleepy or very alert

• Say things that don’t make sense

• Not know where they are

• Think they are somewhere else (like on holiday)

• See or hear things that aren’t real

How Long Does It Last?

Delirium can last a few days or longer. It often gets better when the cause is found and treated. But some people may stay confused for weeks.

What Should You Do?

If you think someone has delirium, tell a doctor or nurse. It’s important to get help quickly.

Here is a video explaining delirium: