They can be life-saving but radiation from the scans also contributes to cancer risk. The authors of a new study estimate overuse of CT scans is increasing the U.S. cancer burden.

It's known that obesity is linked to many cancers. A study shows metabolic syndrome, which includes factors like high blood pressure and insulin resistance, also drives increased risk.

The FDA will soon move to ban formaldehyde in hair-straightening products. It's more than a decade after research raised alarms about health risks and other worrying chemicals remain in the products.

Millions of people in the U.S. have a genetic variant that raises their risk of cancer. Genetic testing can help people find cancer earlier and seek treatment. But many patients aren't offered it.