Prevalence of anemia in the elderly is high, increases with age and is most often mild. Etiological diagnosis is made in about 70 % of cases, leaving 30 % of unexplained anemia. The unexplained cases are probably multifactorial in relation to usual etiologies of anemia but not detected due to inappropriate diagnosis criteria for advanced age. Recent studies show other potential etiologies for unexplained anemia with new perspectives for treatments.
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