A high white blood cell count usually indicates: An increased production of white blood cells to fight an infection. A reaction to a drug that increases white blood cell production. A disease of bone marrow, causing abnormally high production of white blood cells.

What happens if WBC count increases?

A high white blood cell count may indicate that the immune system is working to destroy an infection. It may also be a sign of physical or emotional stress. People with particular blood cancers may also have high white blood cells counts.

Why WBC get increased?

The following conditions can cause white blood cell counts to be high: Viral or bacterial infection. Inflammation. Excessive physical or emotional stress (such as fever, injury, or surgery)