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Alzheimer’s disease

Similar term(s): Alzheimer disease, AD, Alzheimer’s.

Definition:

Alzheimer's disease (AD) is a degenerative brain syndrome characterized by a progressive decline in memory, thinking, comprehension, calculation, language, learning capacity and judgment sufficient to impair personal activities of daily living.

Source: WHO, Mental Health Facts and Figures 

More:

The rate of occurrence of Alzheimer’s disease increases exponentially with age, which means that it occurs very rarely among those 40-50 years old, increases between 60 and 65 years, and is very common over 80 years.

It is important, however, to differentiate the symptoms of Alzhemimer's disease from normal age-related decline in cognitive functions which is more gradual and leads to much milder disability.

Source: GreenFacts, based on WHO, Mental Health Facts and Figures 

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