Experts don’t yet have all the answers about what causes cancer. There are, however, certain characteristics—called risk factors—that may increase your likelihood of developing cancer. You can control some risk factors (smoking, for example), but not others (like your race or age). Moreover, some cancers can be caused by factors in your environment, such as exposure to the ultraviolet (UV) radiation in sunlight. And a small number may be linked to an initial infection with a virus or bacteria. Beyond those risk factors, some cancers are also inherited, meaning they are passed down through your family. According to the American Cancer Society, about 5 percent to 10 percent of all cancers are inherited from gene defects (mutations). In some cases, researchers have figured out the exact genes that may cause cancer, and they can sometimes provide genetic counseling to help you understand your risk. But other cancers are caused by mutations that happen to an individual over time.An important way for you to possibly detect cancer early, when it’s easier to treat, is to undergo a cancer screening. Through screenings, doctors check people who don’t necessarily have any cancer symptoms. Depending on your age, gender or other risk factors, your care team may recommend you get checked for certain cancers.