Dementia is always chronic and we never classify acute dementia and chronic dementia. "Acute dementia" is actually delirium. Delerium is also called the acute confused state, and it is a medical condition that results in confusion and other disruptions in thinking and behavior, including changes in perception, attention, mood, and activity level. Delerium can be caused by an acute medical illness, a "brain event," such as stroke or bleeding from an unrecognized head injury, an adverse reaction to a medication, mix of medications or to alcohol, and withdrawal from abruptly stopping a medication, alcohol or nicotine. Chronic dementia may be caused by Alzheimer's disease, brain damage due to reduced or blocked blood flow in blood vessels leading to the brain, abnormal clumps of protein found in the brain, and the degeneration of nerve cells in the frontal and temporal lobes of the brain.
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