red blood cells as well as platelets), splenectomy (removal of the spleen organ), trauma, asphyxiation, rheumatoid
arthritis, iron-deficiency and posthemorrhagic anemia (low iron in
your blood and anemia that comes after bleeding),
acute infections, heart disease, cirrhosis (results from liver dysfunction), chronic pancreatitis (inflammation of the pancreas), and tuberculosis.
It says "In 50% of those patients who exhibit an unexpected increase in platelets, a malignancy will be found.