Low lymphocyte ratio may be a normal condition, but we cannot rule out pathological conditions such as upper respiratory tract viral infections, etc. Regular pregnancy checkups, sufficient rest and oral medication should be taken to treat the disease. After pregnancy, due to the stimulation of the embryo and the increase of blood volume in the whole body, pregnant women may have neutrophilia, and the corresponding lymphocyte ratio may be low. If the pregnant woman has no obvious discomfort symptoms, it is usually normal. In daily life, attention should be paid to regular pregnancy checkups, maintaining sufficient rest, appropriate exercise and a positive and optimistic mindset. If a pregnant woman has an upper respiratory tract viral infection, her lymphocyte ratio may also be low, and she may experience symptoms such as coughing and phlegm. At this time, pregnant women should drink plenty of fluids, get enough sleep, and follow the doctor’s instructions to use antiviral drugs such as oseltamivir phosphate for treatment. If a pregnant woman has a low lymphocyte ratio, it is recommended that she consult a doctor in a timely manner and under the guidance of the doctor, complete the relevant examinations to identify the cause of the disease and treat the symptoms.