Buzzing in ears after radiotherapy for nasopharyngeal cancer is abnormal, which may be caused by radioactive otitis media or tumor recurrence. 1. Radioactive otitis media: If there is buzzing in ears after radiotherapy for nasopharyngeal carcinoma, it is likely to be due to the damage of radiation to the function of Eustachian tube during treatment, which leads to blockage of Eustachian tube and increase of secretion in the ear canal, and radioactive otitis media will often be formed, resulting in uncomfortable symptoms such as hearing loss, tinnitus and so on. Antibiotics or glucocorticosteroids can be used locally under doctor’s guidance. 2. Tumor recurrence: due to the recurrence of tumor compression to the Eustachian tube, causing secretory otitis media, which leads to buzzing in the ears. If the tumor recurs, it is necessary to take surgical treatment, radiotherapy and chemotherapy in time. Buzzing after radiotherapy for nasopharyngeal cancer must be treated as early as possible, otherwise it may lead to irreversible damage.