癌症是一组可影响身体任何部位的多种疾病的通称。使用的其它术语为恶性肿瘤和赘生物。癌症的一个决定性特征是异常细胞快速生成，这些细胞超越其通常边界生长并可侵袭身体的临近部位和扩散到其它器官。后者被称为转移。广泛转移是癌症死亡的主要原因。
中医治疗作为我国的传统特色，我们也专门总结了一篇中医治疗方法(详见，放链接)。 中医主要用于治疗晚期癌症，包括肺癌、胃癌、肝癌、结直肠癌、乳腺癌、淋巴瘤、 食管癌、鼻咽癌等，有时还可联合化疗或放疗，以缓解不良反应，提高疗效。同时， 中医在术后恢复方面也有较好的应用效果。
The central job of DNA problems and epigenetic defects in DNA repair genes in carcinogenesis The classical view of most cancers is a list of disorders pushed by progressive genetic abnormalities that come with mutations in tumor-suppressor genes and oncogenes, As well as in chromosomal abnormalities. A role for epigenetic alterations was identified from the early twenty first century.[103]
Medical procedures is the primary means of remedy for the majority of isolated, strong cancers and should Participate in a job in palliation and prolongation of survival. It is typically a significant Element of the definitive diagnosis and staging of tumors, as biopsies are generally necessary.
Symptoms of cancer metastasis depend on The placement with the tumor. When cancer starts, it produces no indications. Indicators and signs or symptoms surface since the mass grows or ulcerates.
例如，如果您遗传了一种使您易患癌症的基因突变，并不意味着您一定会患癌症。可能需要有一个或多个其他基因突变才会引起癌症。当您接触某种致癌物质时，您的遗传基因突变可能使您比其他人更容易患癌症。
戒烟。如果您抽烟，请戒烟。如果您不吸烟，请勿开始抽烟。抽烟与多种癌症有关，而不仅仅是肺癌。立即停止吸烟会降低您将来患癌症的风险。
Cancer diagnosis could cause psychological distress and psychosocial interventions, which include chatting therapy, may assist people with this.
有癌症家族史、癌症相关疾病者应定期入院检查，以发现早期病变；如发现局部肿块时，应尽早就医明确病变性质并给予治疗；已明确患有癌症者，在突发出血、剧烈疼痛、呼吸困难等症状时，应紧急入院救治，以免危急生命。
Engraving 癌症 with two sights of the Dutch female who experienced a tumor faraway from her neck in 1689 Most cancers has existed for all of human record.[226] The earliest written record relating to cancer is from c. 1600 BC inside the Egyptian Edwin Smith Papyrus and describes breast cancer.[226] Hippocrates (c. 460 BC – c. 370 BC) explained several kinds of most cancers, referring to them While using the Greek term καρκίνος karkinos (crab or crayfish).[226] This identify arises from the appearance of the cut area of a strong malignant tumor, with "the veins stretched on all sides since the animal the crab has its ft, whence it derives its identify".
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根據組織診斷可判定腫瘤的生長程度，其病程的分級和其他腫瘤特徵。這樣的資訊對於判斷病患的預後情形和選擇最佳治療方式上非常有用。細胞遺傳學和免疫組織化學染色法對於提供有關癌細胞未來可能的發展情況以及選擇治療方式上，都佔有相當重要的角色。
发热：以低热多见，通常不需处理。典型淋巴瘤患者可有发热、盗汗、体重减轻症状。