A high white blood cell count of 0.3 is not normal, but is generally not a major problem, depending on the history and labs. White blood cells are a clinical indicator of infections and hematopoietic disorders, but high white blood cells and infections do not necessarily equate. 1. Mildly high white blood cell counts may occur during menstruation, breastfeeding, or after a full meal without discomfort, which is physiologic and does not require treatment. 2. If fever, cough and other discomforts occur, blood tests, white blood cells and neutrophils are significantly elevated, we must consider the possibility of bacterial infection. In the case of serious infection, white blood cells may not be high or even reduced, and most of them can rise after anti-infective treatment. Drugs include levofloxacin, etc. 3. Problems in the hematopoietic system, such as acute myeloid leukemia, may also cause white blood cell abnormalities. It is recommended to consult a doctor in a timely manner to combine clinical symptoms and signs to comprehensively determine whether the infection or blood system diseases. Treatment and medication should be carried out under the guidance of a physician.