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A high level of white blood cells in the blood. Causes of a high white blood cell count can be infection, reaction to a medicine, a bone marrow condition, an immune system issue, smoking or sudden stress such as hard exercise.

See a healthcare professional right away for the following symptoms:

• Lasting fever.
• High pulse rate.
• Night sweats.

Make an appointment to see a healthcare professional for:

• Greater tiredness.
• Repeat infections.