In some cases, the white blood cells are not low, but may even increase after chemotherapy. This is because sometimes dexamethasone is used in chemotherapy for antiemetic treatment, and dexamethasone is a hormone that may promote the production of white blood cells in the bone marrow, and then the white blood cells may rise after chemotherapy. There are also patients whose bone marrow is more hematopoietic, and although chemotherapy kills a certain number of white blood cells, the bone marrow makes more white blood cells released in the blood, so at this time, if the blood test is done, it will show that the white blood cells are also normal. There are also chemotherapy leukocyte low, with the use of chemotherapy regimen and chemotherapy dose has a relationship, if it is a single drug chemotherapy or chemotherapy dose is relatively low, it is also possible not to cause a drop in white blood cells.