INDEPENDENCE DAY. On July 4, 1776, the thirteen colonies claimed their independence from England, an event which eventually led to the formation of the United States.
Polycythemia vera is a rare, chronic disorder involving the overproduction of blood cells in the bone marrow (myeloproliferation). The overproduction of red blood cells is most dramatic, but the production of white blood cells and platelets are also elevated in most cases.
The symptoms of polycythemia vera occur because of abnormalities affecting the formation of blood cells that result in an overproduction of red blood cells and, to a lesser extent, the overproduction of white blood cells and platelets.