Lewy body dementia is a progressive brain disorder that affects thinking, movement, and behavior. It is characterized by the presence of abnormal protein deposits called Lewy bodies in the brain, which disrupt normal brain function. Symptoms often include fluctuating attention, visual hallucinations, and difficulties with movement similar to Parkinson's disease. This type of dementia can also cause sleep disturbances and changes in mood. Diagnosis can be challenging, as symptoms may overlap with other conditions like Alzheimer's disease or Parkinson's disease. Treatment typically focuses on managing symptoms and improving quality of life for those affected.