A lymphocyte percentage of 45 is not scary. The normal value of lymphocytes is 20% to 40%, and when the lymphocytes are 45%, it means that there is an increase. Lymphocytosis is seen in infectious diseases, tumor diseases and so on. 1. Infectious diseases: It is more common for viral infections to cause an increase in the value of lymphocytes, such as mumps and viral hepatitis, etc. It is not scary, but must be actively treated. (1) Mumps: mainly symptomatic treatment. Early treatment with antiviral drugs such as ribavirin. Fever and pain can be treated with ibuprofen and indomethacin. (2) Viral hepatitis: Acute viral hepatitis can be treated with vitamin C, potassium magnesium mentholatum and other drugs. Chronic viral hepatitis can use adenosine, interferon and so on. (2) Tumor diseases: such as lymphoma, which can be treated by targeted drugs, biological agents, etc., need to be paid attention to. For children under 6 years of age, the lymphocyte percentage is higher for physiologic conditions. There are many reasons for the presence of lymphocyte percentage 45 other than those mentioned above. You should go to the hospital as soon as possible to receive formal examination to determine the cause of the disease and carry out targeted treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.