What causes cancer?

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Answers:
Scientists have learned that cancer is caused by changes in genes that normally control the growth and death of cells. Certain lifestyle and environmental factors can change some normal genes into genes that allow the growth of cancer. Many gene changes that lead to cancer are the result of tobacco use, diet, exposure to ultraviolet (UV) radiation from the sun, or exposure to carcinogens (cancer-causing substances) in the workplace or in the environment. Some gene alterations are inherited (from one or both parents). However, having an inherited gene alteration does not always mean that the person will develop cancer; it only means that the chance of getting cancer is increased. Scientists continue to examine the factors that may increase or decrease a person’s chance of developing cancer.

Although being infected with certain viruses, such as the human papillomavirus (HPV), hepatitis B and C (HepB and HepC), and human immunodeficiency virus (HIV), increases the risk of some types of cancer, cancer itself is not contagious. A person cannot catch cancer from someone who has this disease. Scientists also know that an injury or bruise does not cause cancer.

Other Answers:
racism

smoking. lots of things. there are many cancers.

Jelly Beans. My friend ate 3 or 4 Jelly Beans everyday and she died at 93 from some kind of Cancer. Lay off the Jelly Beans and you'll never die.

preservatives, artificial ingredients to foods that come in cans, jars, prepared food and ready made and cooked food in the market.

stress.
sun.
genetics maybe
hormones? (breast cancer?)

hopefully a scientific researcher here will answer this one.
i think if we knew exactly waht causes cancer there would be no cancer for there would be a cure.

There are multiple causes of cancers such as:
Radiation
Sunlight
Tobacco
Certain viruses
Benzene
Certain poisonous mushrooms and aflatoxins (a poison produced by organisms that can grow on peanut plants)
However, the cause of many cancers remains unknown.
Please see the webpage for more details on Cancer.

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What causes cancer?

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