A white blood cell count of 11.67 x 10^9/L is mildly elevated and generally not serious. The normal value of white blood cell count is usually (4~10)×10^9/L, and the normal value is slightly different in different hospitals. 1. Leukocytes are immune cells of the human body, involved in the body’s defense reaction, mainly divided into neutrophils, lymphocytes, eosinophils, basophils, monocytes and so on. Elevated white blood cells can be categorized into infectious and non-infectious causes. Specific causes need to be judged in conjunction with the specific type of leukocyte. 2. Infectious causes are commonly found in bacterial infections (Streptococcus pneumoniae, Haemophilus influenzae, etc.), parasitic infections (Schistosoma haematobium, amoeba, etc.), fungal infections, etc. Non-infectious causes are commonly found in allergies. Non-infectious causes are commonly found in allergic diseases, malignant tumors, acute hemorrhage, acute poisoning, and blood diseases. 3. It should be noted that high temperature, severe cold, full meal, strenuous exercise, late pregnancy and other non-pathological reasons can also lead to a mild increase in white blood cells. It is recommended to go to the hospital in time to further clarify the diagnosis.