癌症是以异常细胞生长为特征的众多疾病的统称，这些异常细胞会失控地分裂，并能浸润和毁坏正常身体组织。癌症通常可以扩散到全身各处。
Some systemic signs of cancer are a result of hormones or other molecules made by the tumor, often known as paraneoplastic syndromes.
The improved comprehension of molecular biology and cellular biology resulting from most cancers study has led to new therapies for most cancers since US President Richard Nixon declared the "War on Most cancers" in 1971.
最近幾十年的研究中，最為確定的發現就是抽煙和癌症間密切的相關性，許多流行病學研究也已經證實這樣的關係。根據美國的數據顯示，隨著吸煙人數增加，肺癌的死亡率急劇升高。隨著近年來廣為宣導抽菸對身體的傷害之後，抽菸人口的減少，也反映在肺癌死亡率降低上。
For some prevalent cancers, the English organ identify is utilised. For instance, the most typical type of breast cancer known as ductal carcinoma from the breast. Below, the adjective ductal refers to the looks of most cancers under the microscope, which suggests that it has originated within the milk ducts.
從正常組織到腫瘤組織的形態變化 癌組織在顯微鏡下具有鮮明的外觀，主要是有大量分裂中的細胞、變大的細胞核、細胞大小與形狀改變、失去細胞特化的特徵、失去正常組織結構和細胞間的邊界變的不明顯。免疫組織化學染色法和其他分子生物學標記方法可根據腫瘤細胞的特徵提早發現腫瘤，而有助於診斷和預後。
When epigenetic alterations are present in cancers, the epigenetic alterations in DNA mend genes, causing diminished expression of DNA fix proteins, could possibly be of specific great importance.
Engraving with two views of a Dutch lady who had a tumor removed from her neck in 1689 Most cancers has existed for all of human background.[226] The earliest prepared record relating to most cancers is from c. 1600 BC from the Egyptian Edwin Smith Papyrus and describes breast most cancers.[226] Hippocrates (c. 460 BC – c. 370 BC) described numerous forms of cancer, referring to them Using the Greek phrase καρκίνος karkinos (crab or crayfish).[226] This title originates from the looks with the Slash surface area of the sound malignant tumor, with "the veins stretched on all sides as the animal the crab has its ft, whence it derives its identify".
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。
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Complementary and substitute cancer remedies are a various team of therapies, techniques and products that usually are not Section of regular medicine.[202] "Complementary medication" refers to strategies and substances utilized together with typical drugs, though "substitute medicine" refers to compounds made use of in lieu of standard medicine.[203] Most complementary and choice medicines for cancer haven't been analyzed or tested working with traditional approaches which include clinical trials.
避免暴露于紫外线辐射（这主要源于阳光暴晒和人工晒黑设备)和/或采取防晒措施；
Predicting shorter- or long-term survival depends on numerous variables. The main will be the most cancers form and the affected person's age and All round wellbeing. Those who are frail with other health issues have decreased survival costs than if not healthful people. Centenarians are not likely to outlive for five years whether or not procedure is successful.
虽然医生知道哪些因素会增加患癌风险，但大多数癌症会发生于没有任何已知导致癌症的风险因素的人身上。可导致癌症风险增加的已知因素包括：