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Some symptoms of this disease is experiencing: headaches, weakness, dizziness (vertigo), and/or a ringing noise in the ear (tinnitus). In some cases, individuals with polycythemia vera experience itching (pruritis), especially after a hot bath. Affected individuals often have an abnormally enlarged spleen (splenomegaly) and/or liver (hepatomegaly). In some cases, affected individuals may have associated conditions including high blood pressure (hypertension), the formation of blood clots (thrombosis), rupturing of and loss of blood (hemorrhaging) from certain blood vessels, and/or Budd-Chiari syndrome, a rare disorder characterized by obstruction (occlusion) of veins of the liver (hepatic veins).
Some symptoms of this disease is experiencing: headaches, weakness, dizziness (vertigo), and/or a ringing noise in the ear (tinnitus). In some cases, individuals with polycythemia vera experience itching (pruritis), especially after a hot bath. Affected individuals often have an abnormally enlarged spleen (splenomegaly) and/or liver (hepatomegaly). In some cases, affected individuals may have associated conditions including high blood pressure (hypertension), the formation of blood clots (thrombosis), rupturing of and loss of blood (hemorrhaging) from certain blood vessels, and/or Budd-Chiari syndrome, a rare disorder characterized by obstruction (occlusion) of veins of the liver (hepatic veins).


== Secondary polycythemia ==
Secondary polycythemia is caused by either natural or artificial increases in the production of [[erythropoietin]] that result in an increased production of erythrocytes. In secondary polycythemia, there may be 6 to 8 million and occasionally 9 million erythrocytes per cubic millimeter of blood. A type of secondary polycythemia in which the production of erythropoietin increases appropriately is called physiologic polycythemia. Physiologic polycythemia occurs in individuals living at high altitudes, where oxygen availability is less than at sea level.  Many athletes train at higher altitudes to take advantage of this effect — a legal form of [[blood doping]]. Actual polycythemia sufferers have been known to use their condition as an athletic advantage for greater stamina.
Other causes of secondary polycythemia include smoking, renal or liver tumors, or heart or lung diseases that result in [[Hypoxia (medical)|hypoxia]]. Endocrine abnormalities, prominently including pheochromocytoma and adrenal adenoma with [[Cushing's syndrome]] are also secondary causes. Athletes and bodybuilders who abuse [[anabolic steroid]]s or erythropoietin may develop secondary polycythemia.


== Relative polycythemia ==
== Relative polycythemia ==

Revision as of 14:16, 21 September 2012

For patient information on Neonatal polycythemia, click here For patient information on Polycythemia vera, click here

Polycythemia
ICD-10 D45, D75.1
ICD-9 238.4, 289.0, 776.4
DiseasesDB 10295
MeSH D011086

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Symptoms

Some symptoms of this disease is experiencing: headaches, weakness, dizziness (vertigo), and/or a ringing noise in the ear (tinnitus). In some cases, individuals with polycythemia vera experience itching (pruritis), especially after a hot bath. Affected individuals often have an abnormally enlarged spleen (splenomegaly) and/or liver (hepatomegaly). In some cases, affected individuals may have associated conditions including high blood pressure (hypertension), the formation of blood clots (thrombosis), rupturing of and loss of blood (hemorrhaging) from certain blood vessels, and/or Budd-Chiari syndrome, a rare disorder characterized by obstruction (occlusion) of veins of the liver (hepatic veins).


Relative polycythemia

Relative polycythemia is an apparent rise of the erythrocyte level in the blood; however, the underlying cause is reduced blood plasma. Relative polycythemia is often caused by fluid loss eg. burns, dehydration and stress polycythemia.

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