Lewy Body Dementia

Lewy body dementia (also called dementia with Lewy bodies) is a progressive brain condition caused by microscopic protein deposits called Lewy bodies that build up inside brain cells. These deposits disrupt the brain's normal functioning, affecting thinking, movement, behaviour, and mood. It is one of the most common types of dementia, though it is often less well-known than Alzheimer's disease.

One of the distinctive features of Lewy body dementia is that symptoms can fluctuate significantly from day to day, or even within the same day. A person may seem relatively alert and engaged one morning, then become confused and drowsy in the afternoon. This fluctuation can be confusing for families and sometimes leads to misunderstandings about whether the person is "trying hard enough."

Visual hallucinations — seeing things that are not there — are common with Lewy body dementia, particularly in the earlier stages. These can be very vivid and sometimes distressing, though some people learn to recognise that what they are seeing is not real. Sleep problems, including vivid dreams and physically acting out during sleep, are also characteristic of the condition.

Movement can also be affected in ways similar to Parkinson's disease: stiffness, tremor, slow movement, and difficulty with balance. This overlap means that some people are initially diagnosed with Parkinson's before the cognitive symptoms become more apparent.

For caregivers, it is especially important to know that people with Lewy body dementia can be very sensitive to certain medications, particularly some older antipsychotic drugs. Always discuss medication choices carefully with a healthcare professional. Creating a calm, well-lit environment and maintaining a gentle daily routine can help manage fluctuations and reduce confusion.