A decrease in white blood cells can lead to a decrease in immune function, which can lead to a number of diseases, and can be raised more quickly by taking medications and foods. Depending on the cause of the loss of white blood cells, the drugs used are different, commonly used drugs are antibiotics, hormones, immune preparations, white-raising drugs, etc. The first thing to do is to do an etiological examination to determine which bacterial infection is causing the problem, and then choose a sensitive antibiotic to kill the bacteria and help restore the white blood cell count. 2. Hormones: If the white blood cell loss is caused by aplastic anemia, it is mainly related to abnormal cellular immunity, and the decrease in immune function causes a decrease in white blood cell production. Choose cyclosporine and hormonal drugs that promote bone marrow hematopoiesis; 3. Immune agents: If leukemia causes damage to hematopoietic and cytogenic functions, leukocytes will be generated less under the inhibition of leukemic cells, and treatment requires choosing appropriate immune drugs and tyrosine kinase inhibitors according to the typology of leukemia; 4. White-raising drugs: Patients with long-term exposure to radiation or tumors during radiotherapy will be This kind of patients can restore normal white blood cells after stopping exposure to radiation. In addition to medication based on the cause of leukopenia, food can also help replenish leukocytes by eating foods such as milk, lean meat, animal liver, etc., with fresh vegetables and fruits, which have a certain effect of replenishing leukocytes.