1.Blood in nasal mucus, mainly manifested as a small amount of blood in retractable nasal mucus, especially a small amount of blood in the morning and nasal mucus backflow phenomenon. It is often an important signal of nasopharyngeal cancer. 2. Nasal congestion, tinnitus, neck lump, headache, etc. It is caused by the mass compressing adjacent tissues and lymphatic metastasis. 3.Tinnitus and headache are caused by the mass pressing on the eustachian tube. 4.One-sided migraine, facial numbness, diplopia. It is also caused by protruding eyes, tongue deviation, difficulty in opening mouth, etc. The prevention principle of nasopharyngeal cancer is to reduce the contact with risk factors, such as eating less or no pickled or moldy food, such as salted fish, salted vegetables, cured meat, etc., and not smoking. Get rid of potential risk factors, and those with severe inflammation of glands and nasopharyngeal ulcers should be actively treated. 1.Strengthen environmental protection, reduce air pollution, keep indoor air fresh, open windows in time to remove smoke, and pay attention to adjusting indoor temperature and humidity. 2.People with a high incidence of nasopharyngeal cancer or a family history of nasopharyngeal cancer should go to the hospital regularly for cancer screening and EBV serological examination, and follow up and observe suspected cases closely. 3.Eat less or no pickled or moldy food, such as salted fish, pickled vegetables and meat. 4.Quit smoking. 5.Actively treat chronic inflammation and hyperplasia of the nasopharynx, ulcers, etc., and remove risk factors. 6.Men over 35 years old should check nasopharyngeal secretions frequently, pay attention to abnormal sensations in the head and neck, and seek medical consultation timely when abnormalities are detected. 7.Patients after radiotherapy for nasopharyngeal carcinoma should pay attention to keep their mouth clean and hygienic, and not to extract teeth within 2~3 years after radiotherapy, but to fill teeth. 8.Young nasopharyngeal cancer patients should consider marriage and childbirth after at least 3 years of treatment. 9.Nasopharyngeal carcinoma should be reviewed regularly within 2~3 years after treatment, generally once every 1-3 months within 1 year after radiotherapy, in order to detect and deal with recurrence, metastasis and post-radiation complications in time. Nasopharyngeal cancer is curable, and the overall 5-year survival rate of radiotherapy is 45%~50%, 85%~90% for stage I, 70%~75% for stage II, 40%~45% for stage III, 15% for stage IVa (without distant metastasis), and 0% for stage IVb (with distant metastasis). It shows that the earlier the detection, the better the treatment effect, and the “three early stages” should be emphasized, i.e. early detection, early diagnosis and early treatment. The 5-year survival rate of radiotherapy for nasopharyngeal carcinoma is 32%~53%, and it can be as high as 60%~80% in early stage cases.