疼痛是肿瘤患者最常见却又最难控制的症状之一。据WHO统计全世界每年有1000万新发癌症患者,600万人死于癌症,其中50%的患者有癌性疼痛症状,70%的晚期癌症患者以疼痛为主要症状。癌性疼痛(cancer pain)是指由癌症、癌症相关性病变及抗癌治疗所致的疼痛,常为慢性疼痛, Pain is one of the most common but difficult to control symptoms of cancer patients. According to the statistics of WHO, 10 million new-onset cancer patients and 6 million people die of cancer each year in the world, of which 50% have cancerous pain symptoms and 70% of advanced cancer patients have pain as the main symptom. Cancer pain refers to pain caused by cancers, cancer-associated lesions and anti-cancer treatments, often chronic pain,