止痛藥，如嗎啡、羥可酮（英语：oxycodone）、止吐劑及其他藥物用來抑制噁心和嘔吐，都是常用來減輕癌症患者症狀的藥物。
註解：癌細胞將於所到之處繼續失控的繁殖。舉例：若肺癌細胞轉移到肝臟，則肝臟將出現不斷增生的肺部細胞（不具肺功能），且此細胞具有入侵正常肝臟細胞的能力，導致肝功能不斷降低；反之，不具入侵能力但失控繁殖的細胞，稱為良性腫瘤。
Veterinary oncology, concentrating primarily on cats and canine, is often a developing specialty in wealthy countries and the most important varieties of human treatment for instance surgical procedure and radiotherapy could possibly be offered.
癌症易复发、转移，早期患者复发率、转移率偏低，有些可治愈，中晚期患者复发率、转移率、致死率高，通常预后不良。
大约三分之一的癌症死亡源自烟草使用、高体重指数、酒精消费、水果和蔬菜摄入量低以及缺乏身体活动。此外，空气污染是肺癌的一个重要危险因素。
以放疗为主要手段来杀灭瘤细胞，达到治愈的目的。适用于鼻咽癌、头颈部癌症、前列腺癌、宫颈癌、肛管癌、肺癌、食管癌、恶性淋巴瘤、皮肤鳞癌、骨巨细胞瘤等。
不存在生物抵抗性；无潜在致癌可能；不受肿瘤差异性影响；能提供准确的病理分期及组织学类型；适用于大部分未扩散的肿瘤。
Western conceptions of people' legal rights for individuals with most cancers include things like a obligation to totally disclose the health-related situation to the individual, and the right to interact in shared decision-generating in a method that respects the individual's possess values. In other cultures, other legal rights and values are desired. By way of example, most African cultures price total households rather then individualism. In areas of Africa, a analysis is usually produced so late that overcome is impossible, and cure, if offered at all, would swiftly bankrupt the spouse and children. Because of these variables, African healthcare companies often Permit relatives make your mind up regardless of whether, when And the way to disclose the prognosis, and they have a tendency to do so slowly and circuitously, as the individual reveals desire and an power to cope with the grim information.
如伴有局部感染可使用消炎药，与病毒感染相关者可使用抗病毒药物，癌性疼痛者可用阿片类镇痛药物等。
会破坏正常组织；可有手术并发症，可致畸形、影响正常功能，甚至危及生命；已有转移者，不能完全治愈；重要器官无法彻底切除。
不斷增生的癌細胞撐破腫瘤，癌細胞因而擴散至腫瘤周遭的組織及鄰近的淋巴結甚至更遠處。此時癌細胞流竄於原始病灶附近，必需借助循環全身的化學治療藥物治療。
The Dutch professor Francois de la Boe Sylvius, a follower of Descartes, believed that all illness was the result of chemical procedures Which acidic lymph fluid was the cause of cancer. His present-day Nicolaes Tulp believed that most cancers was 癌症 a poison that gradually spreads and concluded that it was contagious.[230]
肿瘤在其生长过程中，虽然能够暂时通过建立新生血管解决自身给养问题，但是快速的增长一样会将之推向资源和空间匮乏的边缘。隨著腫瘤細胞持續生長，在這樣競爭的壓力下，这时肿瘤就会扩散。而这种肿瘤在生长过程中侵略性不断增加的过程则被称为演进（development）。具体的行为则是生长的加快，并且开始入侵周遭的正常组织（癌症浸润），并且通过血管转移到远端（癌症转移）。
有些恶性肿瘤，并不被称为癌或肉瘤，而是以“恶性……瘤”的名词出现，如恶性黑色素瘤。