Soreness of joints during the recovery period of nasopharyngeal cancer may be a side effect caused by radiotherapy, or bone metastasis, it is recommended to consult a doctor as soon as possible, improve the examination under the doctor’s guidance, clarify the cause of the disease, and actively treat it. Sore knees after radiotherapy for nasopharyngeal cancer may be a side effect caused by radiotherapy, which can be recovered by itself after stopping radiotherapy, and the pain may be caused by calcium deficiency. If joints are sore and swollen during nasopharyngeal cancer recovery period, pain relieving drugs, such as aspirin, can be taken under doctor’s guidance for relief. Sore and swollen joints during the recovery period of nasopharyngeal cancer cannot completely exclude the possibility of bone metastasis, so it is necessary to improve CT, bone scan and other related examinations. If bone metastasis is confirmed, further treatment should be carried out under the guidance of doctor and regular anti-bone metastasis treatment should be carried out. Nasopharyngeal cancer is a common malignant tumor with rapid development. Once the disease is found, it should be treated systematically through surgery or radiotherapy according to the specific stage and the actual condition of the patient, and should not take drugs blindly. If joints are sore and swollen during the recovery period of nasopharyngeal cancer, it is recommended that patients go to regular hospitals in time to find out the causes of the disease and carry out treatment under the guidance of professional doctors.