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In a normally functioning body, cells divide to replace older cells and repair injuries. The process of growth, division, and death occurs in a controlled manner to maintain the health of the body. Cancerous cells, however, continuously grow and divide, without any means of control or order. If these cells continue to grow and divide, and the body does not need them, a mass of cells, called a tumor forms. Benign tumors are not harmful and can usually be removed without recurrence. However, the accumulation of cells in the affected tissue can damage surrounding tissues. Metastasis occurs when the cells spread to a different area of the body through a transport system, such as the blood stream or lymphatic system. Metastasis usually results from a malignant, or cancerous, tumor, which easily damage body tissue and often threaten life. Cancer is named for its origin within the body. The primary site of cancer is the area first diagnosed with cancerous cells, and determines the name of the cancer. If the cancer metastasizes, the primary name is retained, regardless of what part of the body is affected.

"In America, half of all men and one-third of all women will develop cancer during their lifetimes." Cancer is the second highest killer in America. Anyone is at risk for developing cancer, but certain lifestyles and habits increase that risk. The lifestyles and habits include such factors as smoking, drinking, sexual choices, diet, sun exposure, and physical activity, all factors controllable by the individual. Cancer development can also be genetically influenced. Most cancers are treatable if detected early enough. Knowing prevention techniques and being conscious of risk factors will decrease the likelihood of developing cancer.

Cancer can affect any type of the body. Five common types of cancer this page focuses on are:

cervical cancer

colon cancer

liver cancer

lung cancer

skin cancer