NKT lymphoma is a common pathological type of nasal lymphoma. Radiotherapy reactions such as nasal dryness, nasal congestion, dyspnea, radioactive skin damage, oral inflammation, etc. are common after radiotherapy, and nasal bleeding may occur in a few cases. After radiotherapy, patients are advised to maintain a good state of mind; patients should pay attention to a healthy regular diet, a light diet, maintain a good work and rest routine, and keep indoor air humidity. For those with radiation skin injury, it is required to keep dry and ventilated to avoid bacterial infection as well as oral inflammation, pay attention to brushing and rinsing after three meals, and it is recommended to use a soft-bristled toothbrush and brush teeth gently to avoid gum damage. In case of obvious swelling of gums, or fever, cough, headache, heavy bleeding, or bleeding more than once, patients are advised to go to a regular hospital as soon as possible.