Types of dementia Dementia is the broad term used to describe a number of different conditions affecting the brain, including Alzheimer's disease. Learn more about the different types of dementia. Advice What is dementia? These pages explain what dementia is, including the causes and symptoms, and how it is diagnosed and treated. They also look at the different types of dementia. Advice Alzheimer's disease Alzheimer’s disease is the most common cause of dementia. More than 520,000 people in the UK have dementia caused by Alzheimer’s disease and this figure is set to rise. This group of pages is for anyone who wants to know more about Alzheimer’s disease. It describes the symptoms, how it is diagnosed, and the things that increase a person’s risk of developing it. It also explains the treatments and support that are available. Advice Vascular dementia: what is it, and what causes it? Vascular dementia is the second most common type of dementia (after Alzheimer's disease), affecting around 150,000 people in the UK. Find out more about vascular dementia and what causes it. Advice Dementia with Lewy bodies: what is it and what causes it? Dementia with Lewy bodies (DLB) is a type of dementia that shares symptoms with both Alzheimer's disease and Parkinson's disease. Advice Frontotemporal dementia: what is it? Frontotemporal dementia (FTD) is one of the less common types of dementia. Find out about frontotemporal dementia and what causes it. Advice Creutzfeldt-Jakob disease Creutzfeldt-Jakob disease (CJD) is caused by an abnormally shaped protein called a prion infecting the brain. Advice Young-onset dementia These pages explains what young-onset dementia is, including the causes and symptoms, and how it is diagnosed and treated. Advice Alcohol-related brain damage Learn more about Alcohol-related brain damage (ARBD) and read practical tips for carers supporting someone with the condition. Advice HIV-related cognitive impairment People with HIV and AIDS sometimes develop cognitive impairment, particularly in the later stages of their illness. Advice Mild cognitive impairment (MCI) This page explains what mild cognitive impairment (MCI) is and tells you about some of the main symptoms. Advice Learning disabilities and dementia Read our introduction to dementia in people with learning disabilities. This section includes details of why someone with a learning disability is more likely to develop dementia, and suggestions how they can live well with the condition. Advice Rarer types of dementia Alzheimer's disease is the most common cause of dementia, but there are many rarer diseases and conditions that can lead to dementia, dementia-like symptoms or mild cognitive impairment.