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Overview

What Is Polycythemia Vera?

Polycythemia Vera is a rare, chronic blood cancer in which the bone marrow makes too many red blood cells. It may also produce excess white blood cells and platelets, making the blood thicker than usual. This condition most often affects adults and requires long-term medical care. In simple terms, the polycythemia definition is an abnormal increase in blood cell production.

Symptoms

Polycythemia Vera Symptoms

  • Itching after a warm bath or shower (aquagenic pruritus).
  • Headaches.
  • Dizziness.
  • Blurred or double vision.
  • Unusual redness of the skin.
  • Fatigue.
  • Night sweats.
  • Unexplained weight loss.

Causes

What Causes Polycythemia Vera?

Polycythemia Vera usually results from an acquired change in a blood-forming stem cell, most commonly involving the JAK2 gene. This change causes the bone marrow to make blood cells without normal control. It generally develops during a person’s lifetime and is not usually inherited from a parent.

How It Differs From Secondary Polycythemia

Secondary polycythemia occurs when another condition or exposure signals the body to make more red blood cells. Causes can include low oxygen, smoking, lung or heart disease, living at high altitude, or certain medicines. Unlike Polycythemia Vera, secondary polycythemia is not primarily caused by an abnormal bone marrow stem cell.

Risk Factors

Risk Factors for Polycythemia Vera

  • Older age is associated with a higher likelihood of developing Polycythemia Vera.
  • The condition is diagnosed more often in people assigned male at birth.
  • A history of certain blood disorders or abnormal blood counts may be associated with increased risk.

Complications

Polycythemia Vera Complications

  • A deep vein thrombosis can develop when a clot forms in a deep vein, often in the leg.
  • A pulmonary embolism can occur when a clot travels to and blocks an artery in the lungs.
  • A stroke may result when a clot reduces blood flow to part of the brain.
  • A heart attack may occur if a clot blocks blood flow to heart muscle.
  • Abnormal bleeding can occur even when blood clotting risk is increased.
  • The spleen may become enlarged as it works harder to filter abnormal blood cells.
  • Gout can develop when increased blood cell breakdown raises uric acid levels.
  • The disease may progress to myelofibrosis or, less commonly, acute leukemia.

Seek urgent care

Clot or bleeding warning

Sudden chest pain, trouble breathing, one-sided weakness, severe headache, confusion, or unusual bleeding requires urgent medical evaluation.

Diagnosis

How Is Polycythemia Vera Diagnosed?

Evaluation often begins with a complete blood count showing elevated hemoglobin or hematocrit. The test may also show increased white blood cells or platelets. These findings help clinicians decide which additional tests are needed.

  • Repeat blood counts help confirm that elevated blood cell levels persist.
  • An erythropoietin blood test helps distinguish Polycythemia Vera from some secondary causes of increased red blood cells.
  • JAK2 mutation testing looks for the acquired genetic change commonly linked with the condition.
  • Oxygen-related testing may be used when low oxygen or another secondary cause is suspected.
  • A physical examination may check for an enlarged spleen.
  • A bone marrow biopsy may be recommended in selected cases to assess blood-forming tissue.

Treatment & Management

Polycythemia Vera Treatment and Management

Polycythemia Vera treatment is individualized by a hematologist. It generally aims to keep the hematocrit in a safer range, prevent blood clots, relieve symptoms, and monitor for disease progression. Because p vera is usually chronic, care includes regular blood-count checks and follow-up.

LOWER BLOOD CELL LEVELS

Therapeutic phlebotomy removes a measured amount of blood to reduce the concentration of red blood cells and lower hematocrit.

REDUCE CLOT RISK

Low-dose aspirin may be recommended for some people when appropriate, based on individual clotting and bleeding risks.

CONTROL BLOOD PRODUCTION

Cytoreductive medicines such as hydroxyurea, interferon, or ruxolitinib may be used for selected patients to reduce blood cell production.

RELIEVE SYMPTOMS

Symptom management may include treatment for itching or gout, along with supportive care tailored to the person’s needs.

Outlook and Prognosis

Outlook and Prognosis for Polycythemia Vera

Polycythemia Vera is generally a lifelong condition without a routine cure, but many people manage it for years with regular blood-count monitoring and treatment. Care is designed to reduce clotting and bleeding risks, control symptoms, and identify changes early.

  • Age can influence overall outlook and the risk of complications.
  • A history of blood clots may increase future clotting risk.
  • Cardiovascular risk factors can affect the likelihood of complications.
  • Blood counts help clinicians assess disease activity and guide treatment.
  • Response to treatment influences how well blood cell levels and symptoms are controlled.
  • Progression to myelofibrosis or acute leukemia can affect long-term prognosis.

When Should You See a Doctor

When Should You See a Doctor?

Get emergency help

Clot or bleeding signs

Seek emergency care for chest pain, sudden shortness of breath, coughing blood, one-sided weakness, trouble speaking, a severe sudden headache, fainting, or heavy or unexplained bleeding.

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