Low chemotherapy leukocytes generally recover in a few days, depending on the treatment measures and the specific situation of the patient, should be specific analysis of specific problems, not a generalization. Low white blood cells after chemotherapy are usually caused by the myelosuppressive reaction to chemotherapy. In addition, patients may also have lower hemoglobin, lower platelets and other reactions. In the case of mild leukocyte reduction, usually seen 1-3 weeks after chemotherapy, treatment with leukocyte-elevating drugs can be applied and last for about 2-4 weeks to gradually recover without affecting chemotherapy. In the case of severe myelosuppression, white blood cells are severely depressed and difficult to rise, and the specific recovery time varies from person to person. In addition, the patient also has the possibility of causing infection, so protective isolation is required and chemotherapy can be continued only after the leukocytes have recovered. In addition, the patient’s diet is recommended to be appropriately supplemented with a high-protein diet, such as fish, eggs, protein powder, etc. Intravenous supplementation with amino acids and fatty milk can also be used to help raise white blood cells.