Mixed dementia is a situation in which a person has more than one type of dementia. Mixed dementia is very common, and the most common combination is vascular dementia and Alzheimer’s. One 2017 research review suggests that 22% of older adults had both conditions, though more recent studies note it could be higher.
Mixed dementia can cause different symptoms in different people. Some people experience memory loss and disorientation first, while others he behior and mood changes. Most people with mixed dementia he difficulty speaking and walking as the disease progresses.