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Related Dementias

Types of Lewy Body Dementia

Lewy body dementia (LBD) includes two related conditions—dementia with Lewy bodies and Parkinson’s disease dementia. The difference between them lies largely in the timing of cognitive (thinking) and movement symptoms. In dementia with Lewy bodies, cognitive symptoms are noted within a year of parkinsonism, any condition that involves the types of movement changes, such as tremor or muscle stiffness, seen in Parkinson’s disease. In Parkinson’s disease dementia, movement symptoms are pronounced in the early stages, with cognitive symptoms developing years later.Older woman with daughter behind her shoulder

Dementia with Lewy Bodies

People with dementia with Lewy bodies have a decline in thinking ability that may look somewhat like Alzheimer’s disease. But over time they also develop movement and other distinctive symptoms that suggest dementia with Lewy bodies.

Symptoms that distinguish this form of dementia from others may include:

  • Visual hallucinations early in the course of dementia
  • Fluctuations in cognitive ability, attention, and alertness
  • Slowness of movement, difficulty walking, or rigidity (parkinsonism)
  • Sensitivity to medications used to treat hallucinations
  • REM sleep behavior disorder, in which people physically act out their dreams by yelling, flailing, punching bed partners, and falling out of bed
  • More trouble with complex mental activities, such as multitasking, problem solving, and analytical thinking, than with memory

Parkinson’s Disease Dementia

This type of LBD starts as a movement disorder, with symptoms such as slowed movement, muscle stiffness, tremor, and a shuffling walk. These symptoms are consistent with a diagnosis of Parkinson’s disease. Later on, cognitive symptoms of dementia and changes in mood and behavior may arise.

Not all people with Parkinson’s develop dementia, and it is difficult to predict who will. Being diagnosed with Parkinson’s late in life is a risk factor for Parkinson’s disease dementia.

For More Information About Types of LBD

NIA Alzheimer’s and related Dementias Education and Referral (ADEAR) Center
1-800-438-4380 (toll-free)
The National Institute on Aging’s ADEAR Center offers information and free print publications about Alzheimer’s disease and related dementias for families, caregivers, and health professionals. ADEAR Center staff answer telephone, email, and written requests and make referrals to local and national resources.

Lewy Body Dementia Association
1-844-311-0587 (toll-free LBD Caregiver Link)