<unk>  is an acquired cognitive impairment in different cognitive areas such as attention, learning, memory, language, executive function, and motor function.<unk>  may be classified according to the etiology into 5 groups including neurodegenerative, vascular, infectious, drug-related, and metabolic. The most common causes of<unk>  include alzheimer's Disease, parkinson's Disease, binswanger's Disease,<unk>  with Lewy bodies, frontotemporal lobar degeneration,thiamine deficiency,vitamin B12 deficiency, vitamin B6 deficiency, vascular<unk> , marijuana abuse, AIDS
neurosyphilis, and normal pressure hydrocephalus.
Dementia
Orientia
Parkinsonism
Multi-infarct dementia
Semantic dementia
Early-onset Alzheimer's disease
Delirium
Alzheimer's disease