<unk>  is the progressive decline in cognitive function due to damage or disease in the brain beyond what might be expected from normal aging. It should be distinguished from delirium which involves an acute onset, and usually is reversible.<unk>  may affect several cognitive areas, such as memory, attention, language, and problem-solving. In advanced stages of the condition, affected persons may be disoriented in time, place, and/or in person. The diagnosis of<unk>  is primarily clinical and involves the ruling-out other conditions by imaging and laboratory tests. It is important to always screen for depression, especially in older people, since this may be the underlying problem.
Dementia
Orientia
Parkinsonism
Multi-infarct dementia
Semantic dementia
Early-onset Alzheimer's disease
Delirium
Alzheimer's disease