A high white blood cell count may be caused by normal physiological phenomena such as strenuous exercise, or it may be caused by trauma, bacterial infections, blood system disorders and other reasons. 1. When the human body is in a state of stress during strenuous exercise, a high white blood cell count will occur, which is a normal physiological phenomenon. 2. If the patient is traumatized, the body will have a stress reaction and mobilize the white blood cells in the peripheral blood leukocyte pool to be released into the blood, thus resulting in a high white blood cell count. 3. If the patient is infected with bacteria, such as actinomycetes, etc., the bacterial infection will release leukocyte chemotactic factor and interleukin, leading to the release of a large number of neutrophils from the bone marrow and promoting the aggregation of leukocytes to the infected foci, thus resulting in the phenomenon of high leukocyte count. 4. Blood system diseases: such as acute leukemia, myelodysplastic syndromes, etc., can appear peripheral blood leukocyte index is high. If the high white blood cell count is caused by diseases, it is recommended to go to the hospital in time for diagnosis and treatment by professional doctors.