Polycythemia vera
（重定向自Polycythemia Rubra Vera）
![](/Images/godic/202502/03/Polycythemia_vera,_blood_smear1204.jpg")
![Erythromelalgia is a rare symptom of PV, here present in a patient with longstanding polycythemia vera. Note reddish limbs and swelling.](/Images/godic/202502/03/Erythromelalgia1204.jpg")
Polycythaemia (or Polycythemia, see spelling differences) vera (PV, PCV) (also known as erythremia, primary polycythemia, Vaquez disease, Osler-Vaquez disease and polycythemia rubra vera) is a neoplasm in which the bone marrow makes too many red blood cells. It may also result in the overproduction of white blood cells and platelets.