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Lewy Body Dementia Care That Works

Understanding Fluctuating Cognition in Lewy Body Dementia

Why Abilities Change So Quickly and How the Brain Struggles to Stay Stable

Jan Erik Fosmark's avatar
Jan Erik Fosmark
Mar 30, 2026
∙ Paid

One of the most confusing aspects of Lewy Body Dementia is this: the person can seem clear, and then suddenly not. Not gradually. Not predictably. But in a way that feels almost abrupt.

To understand this, it helps to look at one central idea: the brain is struggling to stay stable.

What Fluctuations Really Mean

Fluctuations are not just “good days and bad…

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