Pregnant women often experience an increase in white blood cells, especially a significant increase in neutrophil white blood cells, which is a normal reaction to pregnancy, a corresponding adjustment made by the body to adapt to pregnancy, which is physiological and normal, often manifested as a slight increase in the total number of white blood cells above the upper limit of normal, and a slight increase in the proportion of neutrophils above the upper limit of normal. An increase in leukocytes during pregnancy is often a normal manifestation and does not require too much concern. At this time, the attending obstetrician should do a good job of educating the pregnant woman to avoid anxiety. However, if there is a significant increase in leukocytes, along with symptoms of upper respiratory tract infection such as coughing, coughing and sore throat, or symptoms of urethritis such as frequent, urgent and painful urination, or back pain and painful percussion in the kidney area, it is necessary to seek medical help because it is likely to be an upper respiratory tract infection, urinary tract infection, pyelonephritis, and the leukocyte elevation at this time is abnormally elevated because the pregnant woman’s immunity is reduced, along with Dilated urethra and high incidence of vaginitis during pregnancy, which predisposes to respiratory and urinary tract infections. Mildly elevated white blood cells during pregnancy, especially neutrophilic white blood cells, are often normal and do not require too much anxiety.