Polycythemia overview

Polycythemia Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

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Overview

Polycythemia is a condition in which there is a net increase in the total number of red blood cells in the body. The overproduction of red blood cells may be due to a primary process in the bone marrow (a so-called myeloproliferative syndrome), or it may be a reaction to chronically low oxygen levels or, rarely, a malignancy.