Warning: CT Scans Linked to Increased Cancer Risk

Overusing CT scans in the US could lead to over 100,000 extra cancer cases, including nearly 10,000 in children, according to a study in JAMA Internal Medicine. CT scans use ionizing radiation, which can increase cancer risk. While the risk to individuals is low and often outweighed by the benefits, the high number of scans is concerning.

Researchers from the Institute of Cancer Research, Kaiser Permanente, and the University of California found that the 93 million CT scans done in 2023 could cause 5% of all US cancers. The number of CT scans in the US has risen by 30% since 2009.

The study used a risk model to estimate future cancer cases linked to these scans. It found that 2.5 million children’s scans could result in 9,700 cancers. Adults, who get more scans, are expected to have more cancer cases.

CT scans are vital for diagnosing and treating many conditions, but unnecessary scans should be avoided. In the UK, strict regulations ensure scans are only done when needed, resulting in fewer scans per person compared to the US.

Luis Mendoza, MD, PhD