The body is made up of trillions of cells. Cells are the building blocks of human bodies, and all living things. They are the pieces that make up our muscles, bones, blood, and organs (like skin, lungs, heart, stomach, and brain).
Cancer is caused when cells grow out of control. Cancer can affect any part of the body. Sometimes cancer cells move from one part of the body to another. A type of cancer is usually named after the part of the body where it started (for example, lung cancer).
When cancer is caught early, it is usually smaller and it may not have spread yet. This makes it easier to treat. Cancers of different organs require different treatment. Over the last 20 years, many new treatments for cancers have been developed.
The reason someone gets cancer is not always known. The risk factors are different depending on the type of cancer.
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