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Risk factors
By Mayo Clinic staffWhile doctors have an idea of what may increase your risk of cancer, the majority of cancers occur in people who don't have any known risk factors. Factors known to increase your risk of cancer include:
Your age
Cancer can take decades to develop. That's why most people diagnosed with cancer are 65 or older. While it's more common in older adults, cancer isn't exclusively an adult disease — cancer can be diagnosed at any age.
Your habits
Certain lifestyle choices are known to increase your risk of cancer. Smoking, drinking more than one drink a day (for women) or two drinks a day (for men), excessive exposure to the sun or frequent blistering sunburns, and having unsafe sex can contribute to cancer. You can change these habits to lower your risk of cancer — though some habits are easier to change than others.
Your family history
Only a small portion of cancers are due to an inherited condition. If cancer is common in your family, it's possible that mutations are being passed from one generation to the next. You might be a candidate for genetic testing to see whether you have inherited mutations that might increase your risk of certain cancers. Keep in mind that having an inherited genetic mutation doesn't necessarily mean you'll get cancer.
Your health conditions
Some chronic health conditions, such as ulcerative colitis, can markedly increase your risk of developing certain cancers. Talk to your doctor about your risk.
Your environment
The environment around you may contain harmful chemicals that can increase your risk of cancer. Even if you don't smoke, you might inhale secondhand smoke if you go where people are smoking or you live with someone who smokes. Chemicals in your home or workplace, such as asbestos and benzene, also are associated with an increased risk of cancer.
- Deaths and mortality. Centers for Disease Control and Prevention. http://www.cdc.gov/nchs/fastats/deaths.htm. Accessed April 17, 2012.
- Cancer: All sites. Surveillance Epidemiology and End Results. http://seer.cancer.gov/statfacts/html/all.html. Accessed April 17, 2012.
- What you need to know about cancer. National Cancer Institute. http://www.cancer.gov/cancertopics/wyntk/cancer/allpages. Accessed April 17, 2012.
- Kleinsmith LJ, et al. Understanding cancer. National Cancer Institute. http://nci.nih.gov/cancertopics/understandingcancer/cancer. Accessed April 17, 2012.
- Abeloff MD, et al. Abeloff's Clinical Oncology. 4th ed. Philadelphia, Pa.: Churchill Livingstone Elsevier; 2008. http://www.mdconsult.com/das/book/body/208746819-4/0/1709/0.html. Accessed April 17, 2012.
- Ulcerative colitis. National Institute of Diabetes and Digestive and Kidney Diseases. http://digestive.niddk.nih.gov/ddiseases/pubs/colitis/index.htm. Accessed April 17, 2012.
- NINDS paraneoplastic syndromes information page. National Institute of Neurological Disorder and Stroke. http://www.ninds.nih.gov/disorders/paraneoplastic/paraneoplastic.htm. Accessed April 17, 2012.
- Deng GE, et al. Evidence-based clinical practice guidelines for integrative oncology: Complementary therapies and botanicals. Journal of the Society for Integrative Oncology. 2009;7:85.
- Kushi LH, et al. American Cancer Society guidelines on nutrition and physical activity for cancer prevention: Reducing the risk of cancer with healthy food choices and physical activity. CA: A Cancer Journal for Clinicians. 2012;62:30.
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