It is very common to have low white blood cells with chemotherapy, which is usually caused by the myelosuppressive reaction of chemotherapy. In addition to low white blood cells, chemotherapy may also cause reactions such as lower hemoglobin and lower platelets. Generally, low white blood cells can be treated with drugs that raise white blood cells, and if the white blood cells can be restored, chemotherapy will not be affected. Of course, there are some cases of severe myelosuppression and low white blood cells, which are not effective with oral drugs alone. Sometimes it is difficult to raise the white blood cells and there is a possibility of infection, so protective isolation is needed and chemotherapy can be continued only after the white blood cells recover. It is very important to monitor the blood routine during chemotherapy to see the indicators such as white blood cells and platelets.