Dementia is the loss of cognitive functioning—thinking, remembering, and reasoning—and behavioral abilities to such an extent that it interferes with a person’s daily life and activities. Dementia ranges in severity from the mildest stage, when it is just beginning to affect a person’s functioning, to the most severe stage, when the person must depend completely on others for basic activities of living.
Alzheimer’s disease is a progressive neurodegenerative condition. It is one of the most common forms of dementia, a group of symptoms that lead to a decline in mental function severe enough to disrupt daily life. Alzheimer’s disease causes problems with a person’s memory and ability to learn, reason, make judgments, communicate and carry out daily activities.