The normal value of leukocyte is (4.0~10.0)x 10^9/L, leukocyte 11.9 exceeds this range, which belongs to the elevation of leukocyte, and the physiological causes are mostly transient, which can regress by themselves. Physiological causes are mostly transient and can regress on their own. Pathologic causes need to be treated for the original disease. 1. physiological causes: can be seen in strenuous exercise, emotional excitement and other stressful situations, mostly without other accompanying symptoms, found that the white blood cell elevation, mostly transient, after a period of time can return by itself. 2. Pathological causes: seen in infectious diseases, blood system diseases, also seen in some special states. (1) Infectious diseases: mostly seen in bacterial infections, such as Staphylococcus aureus and Streptococcus pneumoniae infections, etc. In addition to elevated leukocytes, most of them are combined with fever, respiratory or gastrointestinal symptoms, or symptoms of redness, swelling and pus flow from the local foci of infection, which are recommended to apply antibiotic treatments under the guidance of doctors. (2) Blood system diseases: see leukemia, neutrophilia, etc., may be combined with anemia, bleeding, fever and other symptoms, perfect bone penetration and other tests can be clearly diagnosed. (3) Other conditions: such as poisoning, metabolic disorders and other conditions caused by a history of exposure to toxins and other corresponding medical history, it is recommended to go to the hospital for clarification. If there is a transient elevation of leukocytes without other symptoms, there is no need to be overly nervous, and the examination can be repeated periodically. If it is elevated for a long time, you should consult a doctor for a clear diagnosis.