Elevated white cell count commonly indicates an infective pathology. A simple upper respiratory infection or an urinary infection will result in raised counts. Grossly elevated counts could be due to severe infection[sepsis] and rarely could be a form of blood cancer-Leukemia,Lymphoma etc. depending on the subtype of predominant white blood cell.
The causes of WBC to increase are :-Infection , Use of medications as corticosteroids, antibiotics , anti-seizure ,physical or emotional stress , Chronic bone marrow diseases ,chronic leukemia , Tissue damage from burns
One of the most common causes of an elevated white blood count is infection. Your body will manufacture white blood cells in order to fight the infection. Fever would be another sign of infection.
Increase in white blood count is basically an indiaction that body is having some problem like allergy, worms in stomach. it tell us that body is fighting with some allergen although from above every thing appears normal