Generally speaking, white blood cells below 2000/UL after chemotherapy need to be given a white blood cell boosting injection, the specific dosage of white blood cell boosting injection is related to the degree of white blood cell lowering of the patient. Normally, the level of white blood cells within the human body is around 4000~10000/UL, if the actual value is below 3000/UL then it is a secondary white blood cell lowering state, of which 2000~3000/UL belongs to the secondary, 1000~2000/UL belongs to the tertiary, and below 1000/UL belongs to the quaternary. If the white blood cells are below 2000/UL, then a leukapheresis injection is needed. The main ingredient of leukapheresis injection is granulocyte stimulating factor, which can enhance the function of hematopoietic daughter cells, promote cell proliferation and differentiation, and increase the number of neutrophils, thus raising the level of white blood cells. However, it should be noted that some patients may experience some uncomfortable symptoms, such as fever, back pain, bone pain, etc., after taking the injection. Therefore, patients should maintain good communication with the doctor and take some antipyretic and analgesic drugs, such as aspirin, under the doctor’s instruction to relieve the discomfort. Please strictly follow the doctor’s instructions for medication, do not self-medicate.