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canadian cancer society

Cancer information

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What is cancer?

When you or a loved one is diagnosed with cancer, it’s normal to have a lot of questions. Learn about types of cancer, how cancer grows and can affect different organ systems, grading and staging and the role of genes.
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Cancer isn’t just one disease, it’s more than 100 diseases. 

Learn about the risks, signs and symptoms, diagnosis, outlook and treatments for a wide range of cancers.

View all cancer types

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Find cancer early

When cancer is found early, it’s often easier to treat. Screening tests can help find cancers before you’ve even noticed symptoms, but it’s important to get changes in your body checked out as well. Learn when you should see a doctor and when you should be screened for specific cancers.
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Reduce cancer risk

Making changes to reduce your cancer risk doesn’t mean that you will never get cancer – but it does mean that your chance of getting the disease is lower. There’s a lot you can do to help protect your health. Learn simple ways to make healthy choices and informed decisions to reduce your risk of cancer.