Dementia with Lewy bodies (DLB), also known as Lewy body dementia, is a common type of dementia estimated to affect more than 100,000 people in the UK.
"Dementia" is the name for problems with mental abilities caused by gradual changes and damage in the brain. It's rare in people under 65.
It tends to develop slowly and get gradually worse over several years.
People with dementia with Lewy bodies may have:
These problems can make daily activities increasingly difficult and someone with the condition may eventually be unable to look after themselves.
Read more about the symptoms of dementia with Lewy bodies.
See your GP if you think you have early symptoms of dementia, especially if you're over 65 years of age.
If you're worried about someone else, encourage them to make an appointment with their GP and perhaps suggest that you go with them.
Your GP can do some simple checks to try to find the cause of your symptoms and they can refer you to a memory clinic or another specialist for further tests if needed.
Read more about getting a dementia diagnosis.
There's no single test for dementia with Lewy bodies.
The following may be needed to make a diagnosis:
Read more about the tests used to diagnose dementia.
There's currently no cure for dementia with Lewy bodies or any treatment that will slow it down.
But there are treatments that can help control some of the symptoms, possibly for several years.
Read more about how dementia with Lewy bodies is treated.
How quickly dementia with Lewy bodies gets worse varies from person to person.
The average survival time after diagnosis is similar to that of Alzheimer's disease – around 6 to 12 years. But this is highly variable and some people live much longer than this.
If you or a loved one has been diagnosed with dementia, remember that you're not alone. The NHS and social services, as well as voluntary organisations, can provide advice and support for you and your family.
Dementia with Lewy bodies is caused by clumps of protein forming inside brain cells. These abnormal deposits are called Lewy bodies.
These deposits are also found in people with Parkinson's disease, and they build up in areas of the brain responsible for functions such as thinking, visual perception and muscle movement.
It's not clear why the deposits develop and how exactly they damage the brain. It's thought that part of the problem is the proteins affecting the brain's normal functions by interfering with signals sent between brain cells.
Dementia with Lewy bodies usually occurs in people with no family history of the condition, although there have been very rare cases that seem to run in families.