The two are not more serious, just different treatments depending on the disease. Radiation therapy and chemotherapy are different methods of treating malignant tumors. Radiotherapy uses radiation to kill tumor cells and chemotherapy uses chemotherapeutic drugs to kill tumor cells. Radiotherapy can produce bone marrow suppression, white blood cell drop, nausea and vomiting, or some esophageal or throat diseases, and radiotherapy can also lead to radiation pharyngitis and radiation enteritis. And chemotherapy can produce bone marrow suppression, nausea, vomiting, and digestive system reactions. But we will give symptomatic treatment when these reactions occur, and this reaction will not be serious. In addition, there are diseases that can be treated with surgery, but there are diseases that must be treated with radiotherapy at the same time after surgery, and there are also diseases that can be treated simply with chemotherapy or radiotherapy only.