Overview of subjective cognitive decline in Brazil: a narrative review.

Subjective cognitive decline (SCD) is characterized by the individual's self-perception of cognitive decline, without functional impairment and objective confirmation through neuropsychological testing. SCD has been studied as a possible clinical marker of early stages of neurodegenerative diseases, especially Alzheimer's disease. This article presents a narrative review of the available literature on the context of SCD in Brazil, covering conceptual aspects, diagnosis, etiologies, assessment measures used in the country, case outcomes, epidemiological data, and predictors of progression. Proposals for the evaluation and clinical monitoring of patients with SCD were also developed. Although there is growing scientific interest in the topic, gaps remain in the clinical approach to SCD, and a lack of national data and specific tools validated for the Brazilian population persists.