What is dementia?

Dementia is the name for a group of symptoms that commonly include problems with memory, thinking, problem solving, language and perception. In a person with dementia, these symptoms are bad enough to affect daily life.
Dementia is not a disease in its own right, and it is not a natural part of ageing. Rather, the symptoms of dementia are caused by different diseases that affect the brain, including Alzheimer’s disease.

Dementia is caused by loss of nerve cells. It is a progressive condition, meaning that symptoms gradually get worse. This is because when a nerve cell dies, it cannot usually be replaced. As more and more cells die, the brain starts to shrink.

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Who are we?

Alzheimer's Society is the leading support and research charity for people with dementia, their families and carers.

What is dementia?

The term 'dementia' is used to describe the symptoms that occur when the brain is affected by specific diseases and conditions. Symptoms of dementia include loss of memory, confusion and problems with speech and understanding.

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If you have concerns about Alzheimer's disease or about any other form of dementia, please contact the Alzheimer's Society National Dementia Helpline on 0300 222 1122.

Alzheimer's Society
Leading the fight against dementia