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The results that result rely upon most cancers's style and placement. Several symptoms are specific. A lot of commonly come about in people who have other situations. Cancer might be difficult to diagnose and may be deemed a "good imitator".[33]
Some systemic indicators of cancer are due 癌症 to hormones or other molecules produced by the tumor, often known as paraneoplastic syndromes.
相較於遺傳性的基因缺陷，生活方式對於癌症的發生並沒有決定性的影響，這是很重要的一個觀念，現今所謂的危險因子，雖然都是經過流行病學的嚴謹分析而得出的結論，但是科學的結論必須要在嚴格的條件控制之下才會成立。雖然抽菸的確會提高罹患肺癌的機率，但直到目前為止，醫學上仍舊無法精確的定義出抽菸的量，或是幾歲開始抽，一定會引起肺癌。每個人在基因上的不同，使得每個人對不同物質的反應都不相同。所以並沒有所謂絕對健康的生活方式，坊間許多生機飲食和眾多號稱防癌的健康食品，所能得到的效果並不大。不需要杞人憂天的飲食及生活，即使是癌症病患，只要保持正常生活，適當補充養分即可。但是有些高危險因子是所有人都應該要小心避免的，例如抽菸、喝酒、進食快餐和嚼檳榔等。
There exists an association amongst celiac illness and an increased threat of all cancers. Those with untreated celiac disease have a higher risk, but this danger decreases with time right after diagnosis and stringent treatment method. This may be due to the adoption of the gluten-no cost eating plan, which appears to have a protecting role in opposition to the development of malignancy in those with celiac illness.
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癌症是全球排在第二位的死亡原因。不过，随着癌症筛查、治疗和预防的改进，多种癌症的生存率有所提高。
癌症會根據發生的部位，有不同前兆或症狀，但這些前兆也可能由其他疾病引起，因此，如果以下症狀持續數週都沒有改善，請前往醫院進行檢查。
許多預防癌症的想法是根據流行病學的研究而來，分析病患的資料可發現生活方式或是接觸一些環境危險因子的確與特定癌症的發生機率相關。越來越多的證據顯示，根據流行病學研究所提出的建議改善，確實可以讓癌症發病率和死亡率降低。
An extra mutation while in the signaling equipment from the cell could possibly send error-producing signals to nearby cells.
Disruption of only one gene could also final result from integration of genomic substance from the DNA virus or retrovirus, leading to the expression of viral oncogenes during the impacted cell and its descendants.
某些癌症的成長會受某些荷爾蒙的增加或減少而抑制。對荷爾蒙敏感的腫瘤常見的例子有乳癌和前列腺癌，減低或增加體內雌激素或雄激素往往可用來做為補充治療的一種。
适时输液，补充水分及营养，避免水电解质紊乱、营养不良，尤其是进食不佳者。