Alzheimer disease.

摘要

Alzheimer (ALTZ-hi-mer) disease is a condition that affects the brain. It is the most common cause of dementia, which is a loss of brain function that can affect memory, attention, language, and problem solving. It is not completely clear what causes Alzheimer disease. Some people who get it have lower amounts of a certain brain chemical. They also may have proteins that build up in brain cells/These changes may cause brain cells to stop working normally. Alzheimer disease gets worse over time.