Alzheimer’s disease is a neurodegenerative disease and type of dementia characterized by memory loss, poor judgment and decision-making, and a decreasing ability to complete familiar tasks. There are four stages of the disease, each with progressing levels of cognitive decline.
Even as long as a decade before symptoms appear, a person can have preclinical Alzheimer’s, in which plaques begin accumulating in the brain, but cognitive changes aren’t apparent.
