Mayo Clinic Q and A: Blood disorder causes body to make too many red blood cells

DEAR MAYO CLINIC: I have a relative who was diagnosed with polycythemia vera. What is this disorder, and can it be treated? Is any new research being conducted on polycythemia vera? ANSWER: Polycythemia vera is a blood disorder where the body makes too many red blood cells. It's one in a family of diseases called myeloproliferative disorders. In these diseases, bone marrow — the spongy tissue inside bones where blood cells are made — is affected by…
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