There is no specific drug or food that can raise white blood cells the fastest after chemotherapy. Nutrition can be strengthened after chemotherapy, and if the white blood cells are seriously low, drugs to raise white blood cells can be taken or injected as prescribed by the doctor. The drugs used in chemotherapy will kill normal white blood cells while killing cancer cells. After chemotherapy, patients may have low white blood cells, if the degree is not serious, they can pay attention to strengthening diet and nutrition, increasing the intake of high quality protein, minerals, microelements and fiber in moderation, taking moderate activities and ensuring sufficient sleep, and the white blood cells can be restored to normal gradually. If the degree of low white blood cells is serious, you can follow the doctor’s instructions to take drugs to raise white blood cells. Or use recombinant human granulocyte stimulating factor injection to raise white blood cells. If necessary, antibiotics can be used to prevent infections due to low white blood cells. If the white blood cells decrease after chemotherapy, you need to go to the hospital in time, and follow the doctor’s instructions for medication, in order to better treat the disease. Daily attention should be paid to avoid going to crowded places, washing hands frequently, ventilating the living room and disinfecting regularly to prevent infection.