Lymphocyte percentage refers to the percentage of lymphocytes to total white blood cells. Clinically abnormal lymphocyte percentage, such as lymphocytosis is mainly seen in infectious diseases, mainly viral infections, such as measles, chickenpox, mumps, viral hepatitis, etc. It can also be seen in tuberculosis, syphilis, etc. In addition, lymphocytosis and lymphocytosis can also occur in neoplastic diseases such as leukemia, lymphoma, recovery from acute infectious diseases, and after organ transplantation. Lymphocytopenia is mainly seen with the application of adrenocorticotropic hormones, etc., as well as with exposure to radiation, immunodeficiency, and gammoprotein deficiency, which can cause a decrease in lymphocyte percentage.