Mixed dementia, also known as multiple-etiology dementia, is a condition where two or more types of dementia occur together, which often makes it challenging to diagnose and manage. A person with mixed dementia will experience a combination of the symptoms associated with the types of dementia they have.
Mixed dementia can involve any type of dementia. However, the most common forms are Alzheimer’s disease with vascular dementia and Alzheimer’s disease with Lewy body dementia.
It’s not clear how common mixed dementia is when compared with other types, but research based on autopsies suggests that mixed dementia may affect about 1 in every 10 people diagnosed with dementia (Alzheimer's Society, UK)