What Causes A Wbc To Be 16,000?

WBC are white blood cells. These cells fight against infection. Normal levels of WBC are 4500-10,000. Increased levels of WBC can be due to following reasons.

1. Infection caused by bacteria or virus
2. Tissue damage
3. Inflammatory diseases like allergy
   
4. Physical stress
5. Emotional stress
6. Leukemia

Your levels of 16000 can be due any of the above reason except leukemia during which WBC can reach up to 30, 000.