If the cancer recurs after radiotherapy, radiotherapy can be continued, but it needs to be determined according to the specific situation of the patient. If the recurrence is within one year, the second radiotherapy is not recommended. Recurrence over one year can be considered for the second radiotherapy treatment, but it is necessary to ensure that the physical condition allows it. Cancer patients who have recurrence after radiotherapy can be treated by radiotherapy if their physical condition allows it, which can effectively stop the spread of cancer cells and inhibit their growth; however, radiotherapy may cause certain damage to the body, so patients should take into account their own condition for treatment. Radiotherapy will cause damage to the body, which may result in radioactive dermatitis in the radioactive area, and some serious patients even have painful skin erosion and formation of radioactive ulcers; some patients also have vomiting, diarrhea and impairment of immune function, etc. Patients who have this symptom when relapse occurs after radiotherapy need to resume radiotherapy afterward. Patients should strengthen the nutrition after radiotherapy, and should be examined and treated in time when they are not feeling well.