A mild increase in leukocytes during pregnancy, within 12,000×10^3 /dL, is a normal physiological phenomenon as long as it is not greater than 15,000×10^3 /dL. Because pregnancy is a special physiological period, there is a mild increase in white blood cells. If the increase is greater than 15000×10^3 /dL or more, it is considered that there may be inflammation in the body, such as upper respiratory tract infection or urinary tract infection, which may lead to an increase in white blood cells. If your temperature is not high and you do not feel any discomfort, you can also review it again in a week, because laboratory tests can also have certain errors. Check regularly during pregnancy, pay attention to rest and drink more warm water. Usually spicy, cold, stimulating food. Try to eat as little as possible. Regular blood tests are required during pregnancy. Blood tests should not only look at white blood cells, but also neutrophils and lymphocytes for a comprehensive analysis.