The lack of normal mental functioning resulting from injury or disease, which may include changes to personality as well as to memory and reasoning, is

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Dementia specifically refers to the loss of cognitive functioning, including memory, reasoning, and changes in personality as well. Hypomania and euphoria are not related to loss of cognitive functioning, while anxiety may affect cognitive functioning but is not necessarily indicative of an injury or disease.

The Lack of Normal Mental Functioning Resulting from Injury or Disease