Lung cancer tumor of 10 centimeters can be treated with radiotherapy, which can help shrink the tumor lesion and facilitate follow-up treatment. Radiotherapy refers to eliminating tumor cells through local irradiation of radiation to achieve the effect of shrinking or even eradicating tumor lesions. Lung cancer patients can significantly shrink or even eliminate the tumor lesions through local radiotherapy, which can improve the quality of patients’ life and prolong their life span. However, in the process of radiotherapy, skin damage, fever, bone marrow transplantation, nausea, dizziness and other adverse reactions may occur, so it is necessary to standardize the treatment under the guidance of doctors, and the occurrence of the above adverse reactions needs to be dealt with by consulting professional doctors in time, and if necessary, it is necessary to stop radiotherapy.