A dementia diagnosis in the family often comes with more questions than answers, especially when doctors mention Lewy body dementia alongside more familiar names like Alzheimer’s or Parkinson’s. Understanding what sets these conditions apart can help families know what to expect and where to look for support.
What Is Lewy Body Dementia?
Lewy body dementia is one of the primary forms of dementia, alongside Alzheimer’s disease, vascular dementia, and frontotemporal dementia. It’s caused by abnormal protein deposits in the brain, and it’s particularly known for producing hallucinations in addition to the memory and thinking changes seen across dementia types.
Dementia itself isn’t a single disease; it’s a general term for a group of symptoms caused by different underlying brain conditions. That distinction matters because it means the right diagnosis shapes the right care plan. For a full breakdown of dementia types, causes, and symptoms, see Brain Research Foundation’s complete guide to dementia.
How Is Lewy Body Dementia Different From Alzheimer’s?
Alzheimer’s disease accounts for the large majority of dementia cases and is defined by a buildup of amyloid plaques and tangles in the brain.
Lewy body dementia, by contrast, involves a different kind of abnormal protein deposit and tends to bring hallucinations into the symptom picture earlier and more prominently than typical Alzheimer’s does.
Both conditions share common dementia symptoms, including:
- Memory loss, especially forgetting recent events or conversations
- Difficulty with problem-solving and planning
- Communication problems, like struggling to find words
- Disorientation around time and place
- Mood and personality changes, including depression
- Behavioral changes, including withdrawal from social activities
Is Lewy Body Dementia the Same as Parkinson’s?
Not exactly. However, the two are closely related. Both fall under the umbrella of conditions involving abnormal protein buildup that disrupts brain function, and people with either condition can experience overlapping motor and cognitive symptoms.
The relationship between the two is part of why diagnosis can take time and often involves ruling out other conditions first.
How Is Lewy Body Dementia Diagnosed?
There’s no single test for any type of dementia, including Lewy body dementia. Diagnosis typically involves a combination of:
- Physical and neurological exams
- Cognitive testing
- Brain imaging, such as MRI or CT scans
- Blood tests to rule out other causes of the symptoms
Because symptoms overlap so heavily between dementia types, getting an accurate diagnosis often takes patience — and a care team willing to look closely at the full picture.
Why Sleep Problems Matter in Neurodegenerative Disease
Sleep disruption is a common thread across neurodegenerative diseases, including Alzheimer’s and Parkinson’s, and it’s an area we have funded directly. Circadian rhythm disruption doesn’t just make caregiving harder — research suggests it may actually worsen disease symptoms over time.
Research spotlight: In 2011, Brain Research Foundation awarded a $40,000 seed grant to Dr. Ravi Allada, Professor of Neurobiology at Northwestern University, to study the gene that controls the body’s internal circadian clock and its potential role in protecting neurons from degeneration. That early-stage funding helped generate the data behind a $6.7 million follow-on grant to continue the work. Read the full story: Sleep Disorders and Neurodegenerative Diseases.
This is exactly the kind of research a donation to Brain Research Foundation helps make possible: small, catalytic grants that open the door to bigger discoveries.
What Are the Treatment Options?
There’s currently no cure for Lewy body dementia or other forms of dementia, but treatment can meaningfully improve quality of life:
- Medications, such as cholinesterase inhibitors and memantine, to support memory and thinking
- Therapies, including cognitive therapy, occupational therapy, and counseling for both patients and caregivers
- Lifestyle changes, like regular exercise, a healthy diet, and staying socially engaged
Supporting a Loved One With Lewy Body Dementia
Caring for someone with any form of dementia touches the whole family. Brain Research Foundation’s full caretaker’s guide covers this in depth. A few practical starting points:
- Understand the behavior, not just the symptom. Agitation, wandering, or communication struggles are part of how the disease affects the brain — not intentional actions.
- Build routine and simplicity into daily life. Predictable schedules, clear communication, and breaking tasks into smaller steps all reduce anxiety and support independence.
- Practice patience and emotional validation. Even when the reasoning behind a loved one’s emotions isn’t clear, acknowledging their feelings can de-escalate difficult moments and preserve connection.
- Don’t carry it alone. Support groups, respite care, and open family communication all help manage the emotional toll of caregiving.
Research Is the Reason There’s Hope
Every dementia diagnosis — Lewy body, Alzheimer’s, or Parkinson’s — is a reminder of how much is still unknown about the brain. That’s the gap Brain Research Foundation exists to close.
BRF-funded researchers are already working on the questions families are asking right now. Dr. Aimee Kao, M.D., Ph.D., has used BRF support to generate human cell lines that model neurodegenerative disorders, helping establish her lab as a leader in neuroregeneration research. Read more: BRF Accelerates a Lab and Career.
This kind of progress depends on early-stage funding that’s hard to get anywhere else:
- For every dollar BRF awards, grantees have secured an average of $32 in additional funding from other research programs.
- Since 1981, BRF has supported 686 scientists in the pursuit of understanding the brain.
- BRF has provided more than $61 million toward neuroscience research over more than 70 years.
You Can Help Fund the Next Breakthrough
Understanding the difference between Lewy body dementia, Alzheimer’s, and Parkinson’s is a first step. Funding the research that leads to better diagnosis, treatment, and — eventually — cures is the next one.
Donate to Brain Research Foundation today and help fund the kind of early-stage research that turns a $40,000 seed grant into a $6.7 million breakthrough.
Frequently Asked Questions
What is the difference between Lewy body dementia and Alzheimer’s?
Alzheimer’s is driven by amyloid plaques and tangles and accounts for most dementia cases, while Lewy body dementia involves a different type of protein deposit and is especially associated with hallucinations. Both share core dementia symptoms like memory loss and communication difficulty.
Is Lewy body dementia the same as Parkinson’s?
No, but the two are closely related, both involving abnormal protein buildup in the brain and overlapping motor and cognitive symptoms.
How is Lewy body dementia diagnosed?
Through a combination of physical and cognitive exams, brain imaging like MRI or CT, and blood tests to rule out other causes, there is no single diagnostic test.
What causes Lewy body dementia?
It’s caused by abnormal protein deposits in the brain that disrupt normal brain function, leading to memory issues and hallucinations alongside other dementia symptoms.
