癌症篩檢，是希望在一般大眾身上提早找出潛在未發現與早期無症狀的癌症。所進行的測試必須適合廣大民眾能夠負擔，並且安全，無侵入性而且不易有假陽性結果產生。一旦發現癌症的跡象，更精確的後續檢驗，或使用侵入性手術取得組織切片以確定篩檢結果則是必要的。
Some systemic signs or symptoms of cancer are attributable to hormones or other molecules produced by the tumor, called paraneoplastic syndromes.
溃疡性结肠炎等一些慢性健康状况会导致患某些癌症的风险显著增加。向医生咨询相关风险。
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。
由癌症引起的慢性疼痛幾乎都與癌症本身或治療過程（手術、放射線治療、化療）所持續造成的組織損傷有關。癌症患者的疼痛並沒有明顯的產生原因。許多發生嚴重疼痛症狀的癌症患者常常已經接近生命的終點，這時進行姑息疗法會是比較好的選擇。雖然社會上普遍對使用鴉片類麻醉劑的觀感不佳，但在癌末病患的治療上，主要的考量是盡量使患者感到舒適，無論使用鴉片類麻醉劑、手術或物理療法，甚至不應考慮醫療資源的支出，而要盡力使病患能得到最好的照顧。
活體組織切片後取下的組織，經染色後由病理醫師判讀，此圖所示為惡性黑色素瘤之切片 病患可能經由許多症狀或檢驗結果被懷疑罹患癌症，但診斷惡性腫瘤最確定的方式就是經由病理醫師對活體組織切片或經手術取得的組織做病理檢查來證實癌細胞的存在。許多活體組織切片，例如皮膚、乳房或肝臟等，在醫師的診療室內即可取得。但是其他器官的切片，則需要在麻醉情形下在手術室進行。
People with cancer have an elevated possibility of blood clots in their veins which can be daily life-threatening.[210] The use of blood thinners for instance heparin minimize the chance of blood clots but have not been proven to boost survival in people with cancer.[210] Folks who consider blood thinners also have a heightened danger of bleeding.[210]
减少接触室外和室内空气污染，包括氡（一种由铀的自然衰变产生的放射性气体，可能在建筑物中，住宅、学校和工作场所积累）。
Decreased expression of DNA mend genes disrupts DNA repair. That is proven during the determine at the 4th degree from your major. (Within the determine, purple wording indicates the central purpose of DNA destruction and defects in DNA fix inside the progression to cancer.) When DNA repair is deficient DNA hurt stays in cells at a better than common amount (5th level) and leads to improved frequencies of mutation and/or epimutation (sixth degree).
The incidence of lung most cancers is highly correlated with smoking cigarettes. Exposure to unique substances happen to be connected to unique forms of most cancers. These substances are termed carcinogens.
Large-scale mutations entail the deletion or get of the portion of a chromosome. Genomic amplification takes place every time a cell gains copies (often twenty or maybe more) of a little chromosomal locus, generally containing a number of oncogenes and adjacent genetic substance. Translocation occurs when two separate chromosomal locations develop into abnormally fused, typically at a attribute spot.
Just one idea about why those with cancer are blamed or stigmatized, known as the just-earth fallacy, is the fact blaming most cancers 癌症 to the individual's steps or attitudes makes it possible for the blamers to regain a way of Regulate.
Taller folks have an increased danger of most cancers because they have far more cells than shorter men and women. Considering that top is genetically identified to a considerable extent, taller people have a heritable increase in cancer chance.[88]
癌症扩散。随着癌症进展，它可能扩散（转移）到身体其他部位。癌症扩散到哪里取决于所患癌症的类型。