The harms of radiotherapy for nasopharyngeal cancer include local harms and systemic harms, such as difficulty in opening mouth, dry mouth, fatigue, hair loss, abnormal coagulation function and so on. 1. Local hazards: Radiation during radiotherapy for nasopharyngeal cancer will damage normal skin, parotid gland tissue, oral mucosa, brain tissue and spinal cord, which will be manifested as skin peeling, dry mouth, difficulty in opening mouth, congestion and erosion of oral mucosa, encephalitis and spinal cord injury. 2. Systemic hazards: Systemic hazards caused by radiotherapy include weakness, hair loss, abnormal blood clotting function and so on. It is recommended to go to the hospital as soon as possible after discomfort occurs in the course of radiotherapy, and under the guidance of doctors and their own conditions for symptomatic treatment to alleviate the discomfort.