Leukocyte 34 refers to a white blood cell count of 34×10^9/L, which is much higher than the normal value. The normal value of adult leukocyte count is 4~10×10^9/L. Certain physiological conditions such as late pregnancy, childbirth, strenuous exercise, labor, after a full meal or bathing, etc. can make it transiently elevated; pathological conditions such as acute infections, severe tissue injury and massive destruction of blood cells, acute hemorrhage, intoxication or leukemia, bone marrow tumors and so on. 1. Acute infection: purulent coccus infection is the most common cause. 2. Severe tissue injury and massive blood cell destruction: such as severe trauma, extensive burns, major surgery and severe intravascular hemolysis. 3. Acute hemorrhage: within 1 to 2 hours after acute hemorrhage, the white blood cell count will be significantly increased, up to 20×10^9/L. 4. Acute poisoning: diabetic ketoacidosis, uremia, acute lead, mercury poisoning or insect venom, snake venom, etc. Leukocytes and neutrophils can be increased. 5. Leukemia, bone marrow tumor and some malignant tumors: most of the leukemia types have different degree of increase in peripheral blood count; primary thrombocythemia, myelofibrosis, and some digestive malignant tumors, such as hepatocellular carcinoma, gastric carcinoma and so on, can cause neutrophilia, resulting in an increase in white blood cell count. If the white blood cells are found to be higher than normal, it is necessary to go to the hospital in time to find out the cause of the disease.