A memory complaint, also called Subjective Cognitive Decline (SCD), is a subjective disorder that appears to be relatively common, especially in elderly persons. The reports of its prevalence in various populations range from approximately 10% to as high as 88%, although it is generally thought that the prevalence of everyday memory problems lie within the range of 25% to 50%. It has been suggested that SCD may be an indication of cognitive decline at a very early stage of a neurodegenerative disease (i.e. preclinical stage of Alzheimer’s disease) that is undetectable by standard testing instruments. SCD may represent the first symptomatic manifestation of Alzheimer’s disease in individuals with unimpaired performance on cognitive tests.
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