Normal levels of white blood cells are 4300 - 10800. Increase in white blood cell count is called leucocytosis. Increase in white blood cells can be due infectious diseases, allergy, rheumatoid arthritis and burn. It can also be due to stress either physical or emotional. An extremely high number of white blood cells ( more than 30,000) can be due to leukemia. So, if increase in white blood cells is your case then get advice from doctor.