Eat more light, moist, sweet and cold foods, such as soybean milk, pear juice, carrot juice, lotus root juice, sugarcane juice, water chestnut juice, lotus seeds, mung beans, wax gourd, watermelon, mushrooms, tremella, soft-shelled turtle, oysters, lean meat, duck meat and eggs. Radioactive stomatitis caused by radiotherapy of nasopharyngeal carcinoma, such as dry mouth, sore throat, dysphagia, loss of appetite and even oral ulcer. After radiotherapy, this symptom often lasts 1 year. Besides paying special attention to oral hygiene, you should also drink plenty of water. You can use lemon tea to moisten your mouth, or you can use 5g American ginseng slices to soak in water every day instead of drinking tea. At the same time, it is suggested to take compound wall-broken ganoderma lucidum spore powder to enhance anti-tumor immunity.