After radiotherapy, white blood cells usually return to normal in about two to four weeks, depending on the degree of white blood cell decline, individual physical condition, treatment effect and other factors. Radiotherapy will inhibit the hematopoietic function of the bone marrow, and the ability of the bone marrow to produce white blood cells will decrease, and white blood cells will decrease. In general, bone marrow suppression after chemotherapy mainly occurs 7 to 14 days after the end of chemotherapy. It takes about 2 to 4 weeks to recover. Patients with a mild degree of bone marrow suppression and good physical condition can have their white blood cells return to normal in a short period of time. Some patients with significant leukocyte decline and poor physical condition need to use some leukocyte-boosting drugs, such as recombinant human granulocyte-stimulating factor, as prescribed by the doctor in order to restore the leukocyte level. After radiotherapy, the organism should pay attention to rest, appropriate exercise, reasonable diet, if the organism has discomfort, it should go to the hospital in time to avoid delaying the condition.