What is Lewy body dementia?

CBC English
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1 Video View·Oct 31, 2026
Star Trek actor Patrick Stewart's passing has brought
an endless line of tributes,
but it's also raising awareness about one
of the diseases he died from, Lewy body dementia.
You can think of Lewy body dementia
as a mix between Parkinson's disease and dementia.
Lewy body dementia happens
when there are abnormal clumps of a protein called alpha
synuclein that build up inside the brain. These protein deposits can
block the signals that help us think,
They can get a tremor, they can get stiffness
remember and move our bodies.
and slowness of their movements
and have difficulties with walking and balance.
Unlike Alzheimer's, memory loss isn't always a telltale symptom.
One of the early signs can be sleep disturbances.
Vivid dreams, nightmares, sleep enactments.
They may be awake overnight and they may sleep during the day.
Another one can be visual hallucinations.
And as the disease progresses, so can the severity.
At the beginning, it can be seeing insects when they're not there,
and it can evolve into seeing faces, seeing movements.
And in some cases, people cannot be convinced that they are not real.
And diagnosing Lewy body dementia can be hard.
It often coexists with other forms of the disease,
most often Alzheimer's.
Patrick Stewart's spokesperson says he had a brief journey with both.
Many people with Alzheimer's disease can develop features of
Lewy body dementia as the disease progresses
and if you develop any form of dementia after the age
of 65 the reality is it's usually not one pathology
that's causing the dementia but a mixture.
While there is no treatment that can help slow
the progression of the disease,
there are medications that can help manage symptoms.
