What is dementia?

Find out more about what dementia is, how it affects people and how this might impact on your life.
Sarah Bellum

Hi! I’m Professor Sarah Bellum. Dementia might seem complicated but don’t worry – I’m here to explain it to you. Together, we’ll unravel the mysteries of the brain, discover the science behind dementia, and learn how we can make a positive impact to the lives of people living with dementia.

What is dementia?

Now, let's explore a few types of dementia:

Coping when somebody in your family has dementia

Here are some things that may help:


When somebody in your family has dementia, it can change your life in many different ways. It’s normal to feel many different emotions. These feelings are all normal, but they can be very difficult to cope with.

How can I help?

Do you want to learn more about the science behind dementia? Are you thinking about becoming a scientist? Or do you just want to understand more about what’s happening to your loved one? Check out our 'Dementia in detail' series, where you can learn more about how research helps us learn more about the diseases that cause dementia.


Looking for more information about dementia? Check out our dementia information pages here.

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This information was updated in November 2023 and is due for review in November 2025. Please contact us if you would like a version with references.