This document discusses confusion, dementia, and Alzheimer's disease. It begins by explaining how changes in the brain can cause cognitive issues. Confusion has many potential causes like infections, drugs, or reduced blood flow. Dementia involves loss of cognitive function interfering with daily life and is not normal aging. Early signs include memory loss or getting lost. Some dementias can be treated if caused by other medical issues. Alzheimer's disease damages brain cells controlling thinking and behavior, causing memory loss and other issues getting worse over time. Care involves supporting the person and family as the disease progresses and abilities decline.