Polycythemia Vera

Overview

Polycythemia vera is a chronic blood disorder in which the bone marrow makes too many red blood cells. In some people, the number of white blood cells and platelets may also be higher than normal. This can make the blood thicker than usual and may slow blood flow through the blood vessels.

Polycythemia vera belongs to a group of conditions called myeloproliferative neoplasms. These conditions affect the cells in the bone marrow that produce blood cells. Although polycythemia vera usually develops slowly, it requires medical monitoring because it can increase the risk of blood clots and, in some cases, bleeding or other complications.

Many people live with polycythemia vera for a long time with appropriate care. Treatment focuses on controlling blood cell levels, reducing the risk of complications, and managing symptoms. Regular follow-up with a hematology specialist is important.

Symptoms

Some people with polycythemia vera have no symptoms at first, and the condition may be found during routine blood tests. When symptoms occur, they may be mild or develop gradually.

• Headaches, dizziness, or light-headedness
• Tiredness or weakness
• Blurred vision or visual disturbances
• Itching, especially after a warm bath or shower
• Redness or a flushed appearance of the face
• Burning, tingling, or numbness in the hands or feet
• Shortness of breath, especially with activity
• Feeling of fullness or discomfort in the upper left abdomen, which may be related to an enlarged spleen
• Unusual bleeding, such as nosebleeds or bleeding gums

Because polycythemia vera can increase the chance of blood clots, symptoms such as chest pain, sudden shortness of breath, weakness on one side of the body, trouble speaking, sudden severe headache, or swelling and pain in a leg require urgent medical attention.

Causes and Risk Factors

Polycythemia vera is usually caused by an acquired change in the DNA of bone marrow cells. This change affects how blood cells are produced and can cause the marrow to make too many cells. The change develops during a person’s lifetime and is not usually inherited from a parent.

A common genetic change associated with polycythemia vera affects a gene involved in blood cell growth signals. Testing for this change can help support the diagnosis. Having this gene change does not mean a person did anything to cause the condition.

Polycythemia vera is more often diagnosed in adults and becomes more common with increasing age. It can occur in both men and women. A family history of similar blood disorders may be relevant in some cases, but most patients do not have a strong family history.

It is important to distinguish polycythemia vera from other causes of high red blood cell levels, such as low oxygen levels, smoking-related changes, lung or heart disease, living at high altitude, or certain hormone-related conditions. The evaluation by a hematologist helps clarify the cause.

Diagnosis

Diagnosis begins with a medical history, physical examination, and blood tests. A complete blood count can show whether red blood cells, hemoglobin, hematocrit, white blood cells, or platelets are increased. Blood chemistry tests may also be performed to assess general health and organ function.

Additional tests may include measurement of a hormone that helps regulate red blood cell production, genetic testing for changes linked with polycythemia vera, and evaluation of iron levels. In some cases, a bone marrow examination is recommended to look at how blood cells are being produced and to support the diagnosis.

The doctor may also assess whether the spleen is enlarged and whether there are signs of clotting or bleeding complications. Imaging tests may be used when needed, depending on symptoms and examination findings.

Because high red blood cell levels can have several causes, diagnosis should be made by a qualified healthcare professional, often a hematologist, who can interpret the full clinical picture.

Treatment Options

Treatment for polycythemia vera is individualized. The main goals are to reduce the thickness of the blood, lower the risk of blood clots, control symptoms, and monitor for changes over time.

One commonly used treatment is removal of a measured amount of blood through a controlled medical procedure. This helps reduce red blood cell levels. The frequency depends on blood test results and the treatment plan set by the doctor.

Some patients may need medicines that reduce the tendency of blood to clot or medicines that help control the production of blood cells in the bone marrow. The choice of treatment depends on factors such as age, previous clotting history, blood counts, symptoms, and other medical conditions.

Supportive care may include management of itching, monitoring of cardiovascular risk factors, and guidance on healthy lifestyle habits. Patients may be advised to avoid smoking, stay appropriately active, maintain hydration, and follow medical recommendations for conditions such as high blood pressure, diabetes, or high cholesterol.

Regular follow-up is essential. Blood counts and symptoms are monitored over time, and treatment may be adjusted as needed. Patients should not start, stop, or change any treatment without medical guidance.

When to See a Doctor

See a doctor if routine blood tests show high hemoglobin, hematocrit, red blood cell count, white blood cell count, or platelet count. Medical evaluation is also important if you have persistent headaches, dizziness, unusual itching after warm water exposure, unexplained fatigue, visual changes, or redness and burning sensations in the hands or feet.

Seek urgent medical care if you develop symptoms that may suggest a blood clot or serious bleeding, including chest pain, sudden shortness of breath, sudden weakness or numbness, difficulty speaking, severe sudden headache, swelling or pain in one leg, coughing blood, black stools, or heavy unexplained bleeding.

If you have already been diagnosed with polycythemia vera, keep scheduled hematology appointments and report new or worsening symptoms promptly. Ongoing monitoring helps your care team manage the condition and reduce the risk of complications.