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Yes, people with Parkinson's disease (PD) can develop dementia. According to studies, between 18 percent and 41 percent of people with Parkinson's develop dementia or some form of cognitive decline. Additionally, up to 19 percent of people living with Parkinson's already had mild cognitive impairment at the time of Show Full Answer

Yes, people with Parkinson's disease (PD) can develop dementia. According to studies, between 18 percent and 41 percent of people with Parkinson's develop dementia or some form of cognitive decline. Additionally, up to 19 percent of people living with Parkinson's already had mild cognitive impairment at the time of diagnosis. It can take as long as 20 years for cognitive impairment to advance to dementia.

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