放射治疗是鼻咽癌患者的首选治疗手段 ,但放射治疗中的口腔粘膜反应 ,包括充血、水肿、糜烂及溃疡 ,使患者口腔疼痛 ,进食困难 ,生存质量下降 ,甚至放疗中断 ,使疗效降低 ,根据低氧对正常组织具有肯定的放射防护效应 ,我们用降低口腔温度的方法来观察是否能预防鼻咽癌放射所致 Radiation therapy is the preferred treatment for patients with nasopharyngeal carcinoma, but oral mucosal reactions in radiation therapy, including congestion, edema, erosion and ulcers, make patients with oral pain, eating difficulties, decreased quality of life, and even interruption of radiotherapy to reduce efficacy, According to hypoxia on normal tissue with a positive radioprotective effect, we use the method to reduce the oral temperature to observe whether it can prevent radiation caused by nasopharyngeal carcinoma