
09/09/2025
Parkinson’s and Dementia with Lewy Bodies (DLB): Understanding the Overlap
When we think of Parkinson’s disease, movement symptoms often come to mind—tremor, rigidity, slowness.
But for many people, non-motor symptoms like sleep changes, hallucinations, depression, or cognitive decline can be just as life-changing.
One related condition that shows how deeply these symptoms matter is Dementia with Lewy Bodies (DLB).
About 1.4 million people in the U.S. are estimated to live with DLB—a progressive brain disorder that, like Parkinson’s, is caused by abnormal protein deposits called Lewy bodies.
🔹 What makes DLB unique in the Parkinson’s spectrum?
In Parkinson’s disease dementia, movement symptoms appear first, with cognitive changes developing later.
In DLB, thinking problems begin before or within a year of movement symptoms.
This overlap explains why many people with DLB are initially misdiagnosed with Parkinson’s.
Both share symptoms such as:
— Challenges with memory, attention, and concentration
— Tremor, stiffness, and balance difficulties
— REM sleep behavior disorder (acting out dreams)
— Mood changes including depression and anxiety
— Hallucinations or delusions as the disease progresses
For families, these non-motor changes can be as difficult—sometimes more—than the physical aspects of Parkinson’s.
They affect independence, daily life, and emotional well-being.
While there is currently no cure, supportive treatments and care strategies are available to help manage symptoms.
Early, accurate diagnosis and a team-based approach with healthcare providers make a meaningful difference.
That’s also why new therapies are being studied to target non-motor symptoms in Parkinson’s.
The Light for PD clinical trial is exploring light-based therapy to potentially support better sleep, mood, and energy in people with Parkinson’s.
👉 Learn more at lightforpd.com