Cancer
Cancer is the uncontrolled growth of abnormal cells in the body. Cancerous cells are also called malignant
cells.
Cells are the building blocks of living things. Cancer grows out of normal cells in the body. Normal cells
multiply when the body needs them, and die when the body doesn't need them. Cancer appears to occur when the growth
of cells in the body is out of control and cells divide too quickly. It can also occur when cells “forget” how to
die.
There are many different kinds of cancers. Cancer can develop in almost any organ or tissue, such as the lung,
colon, breast, skin, bones, or nerve tissue.
There are many causes of cancers, including:
- Benzene and other chemicals
- Certain poisonous mushrooms and a type of poison that can grow on peanut plants (aflatoxins)
- Certain viruses
- Radiation
- Sunlight
- Tobacco
However, the cause of many cancers remains unknown.
The most common cause of cancer-related death is lung cancer.
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