Risks, possible complications 1, brain damage: acute radioactive brain edema, increased intracranial pressure, brain herniation, headache, dizziness, nausea, vomiting aggravation, chronic radioactive brain damage, mental decline, calculation, cognitive impairment, etc.; 2, children’s growth and development disorders, endocrine function, etc.; 3, five senses damage: cataract, fundus damage, optic nerve damage, eye atrophy, blindness hearing loss, deafness; nasal mucosa atrophy, abnormal smell, easy bleeding, poor ventilation; radioactive stomatitis (oral mucosa inflammation, ulcers), dry mouth (salivary gland secretion inhibition), taste disorders, dental caries, gingivitis, etc., radioactive pharyngitis (laryngeal congestion, edema), painful eating, etc.; 4, systemic reactions and hematopoietic system damage such as: weakness, decreased appetite, nausea, vomiting, bone marrow suppression, etc.; 5, skin, muscle damage: skin redness, muscle damage, etc. 5, skin and muscle damage: skin redness, swelling, peeling, pigmentation, erosion, muscle fibrosis, atrophy, spasm, eye rotation, mouth opening, limited neck movement, etc.; 6, spinal cord damage: radiation myelitis, resulting in limb sensory and motor dysfunction, etc.; Caution 1, head and neck radiotherapy such as irradiation to the parotid gland, avoid acidic food at the beginning of radiotherapy; 2, nasal cavity, nasopharynx radiotherapy, radiotherapy adhere to 3. In radiotherapy and after radiotherapy, insist on mouth opening exercise, at least 5 minutes each time, and moderate neck exercise; 4. Review blood routine once a week, if abnormal, deal with it timely; 5. If you have diabetes mellitus, hypertension, liver and kidney insufficiency, give special diet, if you eat less, eat less and more meals to ensure nutrition supply; 6, avoid emotional excitement, keep a happy spirit; 7, protect the irradiated field skin, it is recommended to wear cotton shirt; avoid skin irritation, especially the use of irritating drugs; it is recommended to cut short nails, avoid scratching the skin; 8, if there is discomfort promptly inform the medical staff to deal with.