=== Præ-demens ===
De første symptomer tilskrives ofte fejlagtigt almindelig skavanker ved [[alderdom]] eller [[stress]].<ref name="pmid17222085">{{vcite journal | vauthors = Waldemar G, Dubois B, Emre M |display-authors=etal | title = Recommendations for the Diagnosis and Management of Alzheimer's Disease and Other Disorders Associated with Dementia: EFNS Guideline | journal = European Journal of Neurology | volume = 14 | issue = 1 | pages = e1–26 | year = 2007 | pmid = 17222085 | doi = 10.1111/j.1468-1331.2006.01605.x | month = January }}</ref> Detaljerede [[neuropsykologi]]ske tests kan afdække mildt kognitivt besvær op til otte år, før en person opfylder de kliniske kriterier for den medicinske [[diagnose]] Alzheimers sygdom.<ref name="pmid15324363">{{vcite journal | vauthors = Bäckman L, Jones S, Berger AK, Laukka EJ, Small BJ | title = Multiple Cognitive Deficits During the Transition to Alzheimer's Disease | journal = Journal of Internal Medicine | volume = 256 | issue = 3 | pages = 195–204 | year = 2004 | pmid = 15324363 | doi = 10.1111/j.1365-2796.2004.01386.x | month = Sep }}</ref> Disse tidlige symptomer kan påvirke visse komplekse daglige aktiviteter.<ref>{{vcite journal | author = Nygård L | title = Instrumental Activities of Daily Living: A Stepping-stone Towards Alzheimer's Disease Diagnosis in Subjects with Mild Cognitive Impairment? | journal = Acta Neurologica Scandinavica | volume = Suppl | issue = 179 | pages = 42–6 | year = 2003 | pmid = 12603250 | doi = 10.1034/j.1600-0404.107.s179.8.x }}</ref> Det tydeligste problem er tab af [[korttidshukommelse]], hvilket viser sig som problemer ved at genkalde sig nyligt lærte fakta og en manglende evne til at opnå ny information.<ref name="pmid15324363"/><ref name="pmid12603249">{{vcite journal | vauthors = Arnáiz E, Almkvist O | title = Neuropsychological Features of Mild Cognitive Impairment and Preclinical Alzheimer's Disease | journal = Acta Neurologica Scandinavica | volume = 179 | pages = 34–41 | year = 2003 | pmid = 12603249 | doi = 10.1034/j.1600-0404.107.s179.7.x }}</ref>
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