Symptom: High white blood cell count

    High white blood cell count is an increase in disease-fighting cells (leukocytes) circulating in your blood. High white blood cell count is also called leukocytosis.

    The threshold for high white blood cell count varies from one medical practice to another. A count of more than 11,000 leukocytes in a microliter of blood in adults is generally considered a high white blood cell count. The threshold for a high white blood cell count in children varies with age and size.

    High white blood cell count

    Specific causes of high white blood cell count include:

    1. Acute lymphocytic leukemia
    2. Acute myelogenous leukemia (AML)
    3. Allergy, especially severe allergic reactions
    4. Chronic lymphocytic leukemia
    5. Chronic myelogenous leukemia
    6. Drugs, such as corticosteroids and epinephrine
    7. Myelofibrosis
    8. Certain bacterial infections
    9. Certain viral infections
    10. Polycythemia vera
    11. Rheumatoid arthritis
    12. Smoking
    13. Stress, such as severe emotional or physical stress
    14. Tuberculosis
    15. Whooping cough

    Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.

    Source: mayoclinic.org

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