In general, the normal value of leukocytes in non-pregnant women is (4-8) x 10^9/L. During pregnancy, due to the increase in blood volume, leukocytes have some room to rise, starting from the 7th week of pregnancy and reaching a peak at the 30th week of pregnancy. The normal range is (5-12) x 10^9/L, up to (14-16) x 10^9/L. If the leukocytes of pregnant women are slightly increased and within the above range, it means that it is a normal physiological phenomenon, mainly due to the increase of blood production in the bone marrow under the action of placental hormones and neuroendocrine during pregnancy, so there is usually no need to worry too much, just drink more water daily and review regularly. However, if a pregnant woman’s leukocyte test result is higher than the normal range during pregnancy and is accompanied by fever, sore throat, cough and other related symptoms, it indicates a pathological cause, suggesting that the mother-to-be may have an inflammatory infection, bleeding, poisoning, etc. Clinically, it is usually considered to be caused by bacterial infection. Common diseases include urinary tract infection, tonsillitis, pelvic inflammatory disease, etc. At this time, it is necessary to actively go to the hospital for consultation and treatment, and apply drugs reasonably under the guidance of the doctor to avoid adverse effects on the fetus. In addition, attention should be paid to eating fresh vegetables and fruits in appropriate amounts to replenish vitamins and enhance immunity, as well as ensuring sufficient sleep and keeping a happy mood to prevent inflammatory diseases such as colds and fevers.