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Lewy body dementia, also known as dementia with Lewy bodies, is the second most common type of progressive dementia after Alzheimer's disease dementia. Protein deposits, called Lewy bodies, develop in nerve cells in the brain regions involved in thinking, memory and movement (motor control).
Lewy body dementia causes a progressive decline in mental abilities. People with Lewy body dementia may experience visual hallucinations and changes in alertness and attention. Other effects include Parkinson's disease-like signs and symptoms such as rigid muscles, slow movement and tremors.
Lewy body dementia signs and symptoms may include:
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Lewy body dementia is characterized by the abnormal buildup of proteins into masses known as Lewy bodies. This protein is also associated with Parkinson's disease. People who have Lewy bodies in their brains also have the plaques and tangles associated with Alzheimer's disease.
A few factors seem to increase the risk of developing Lewy body dementia, including:
Lewy body dementia is progressive. Signs and symptoms worsen, causing:
This article is written by Mayo Clinic Staff. Find more health and medical information on mayoclinic.org.
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