What is PV?

Polycythaemia vera (PV) is pronounced pol-ee-sigh-thee-me-a vee-rah. Poly means many and cythaemia relates to blood cells. It is also sometimes called erythrocytosis, which means too many red blood cells.

PV is a type of rare blood disorder called a myeloproliferative neoplasm. These are conditions that cause an increase in the number of blood cells.

Polycythaemia vera usually develops very slowly. It mainly affects people over the age of 40.

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