Alzheimer's disease , also called Alzheimer disease or simply Alzheimer's, is the most common cause of dementia, afflicting 24&;million people worldwide. Alzheimer's is a degenerative and terminal disease for which there is currently no known cure. In its most common form, it occurs in people over 65&;years old although a less-prevalent early-onset form also exists. The disease can begin many years before it is eventually diagnosed. In its early stages,...
Dementia is a loss of brain function. It is not a single disease. Instead, dementia refers to a group of illnesses that involve memory, behavior, learning, and communicating problems. The...