title: Depression: early warning of dementia?  Persistent sadness might be more than just a mood problem--it could be a warning sign of memory impairment.
mesh_terms: D003071:Cognition; D060825:Cognitive Dysfunction / Q000150:complications* / Q000523:psychology; D003704:Dementia / Q000209:etiology* / Q000523:psychology; D003863:Depression / Q000150:complications* / Q000523:psychology; D018450:Disease Progression; D006801:Humans; D012307:Risk Factors