Alzheimer's disease is a condition that destroys the connections between cells in the brain over time. Eventually these cells die. This affects how the brain works. As cells die, the brain shrinks.

The damaged areas of the brain include the hippocampus, which is an area of the brain that helps new memories form. Damage to the frontal lobe of the brain eventually causes problems with intelligence, judgment, and behaviour. Damage to the temporal lobe affects memory. And damage to the parietal lobe affects language.

Alzheimer's is the most common form of mental decline, or dementia, in older adults.