Low leukocytes after radiotherapy can be manifested as symptoms of infection and other symptoms. 1. Symptoms of infection: leukopenia can cause infection, and the common sites of infection are respiratory tract, digestive tract, genitourinary tract, etc.; patients can have cough, cough sputum, diarrhea, vomiting, frequent urination, urinary urgency, urinary pain, high fever, sepsis; serious cases can cause infectious shock, even life-threatening. 2. Other symptoms: patients with low white blood cell after radiotherapy may have symptoms such as fatigue, loss of appetite, dizziness and so on. Low white blood cell after radiotherapy is usually a side effect of radiotherapy, if the white blood cell drops seriously, you need to suspend radiotherapy, to avoid further aggravation of the condition. Patients with low white blood cells after radiotherapy should actively seek medical attention if the above symptoms occur, and patients should not use their own medication to avoid adverse results.