Thickening of nasopharyngeal wall after radiotherapy for nasopharyngeal cancer is not necessarily recurrence, but may also be fibrous tissue proliferation. 1. If the thickening of nasopharyngeal wall after radiotherapy and magnetic resonance imaging (MRI) suggests uniform density, it is very likely to be fibrous tissue proliferation, which may be relieved or shrunk by itself some time after the end of radiotherapy. 2. If the wall of nasopharynx is thickened and MRI suggests that the density is not uniform, it is possible that nasopharyngeal cancer has recurred, and at this time, it is necessary to improve electronic nasopharyngoscopy and biopsy to further clarify whether it is cancerous tissue. After diagnosis of recurrence, it is necessary to formulate the next treatment plan. After radiotherapy for nasopharyngeal cancer, regular review is needed for early detection and early treatment. Through treatment, life span or quality of life can be prolonged or improved as much as possible.