The phones double the risk of thyroid cancer for people with genetic variations known as SNPs, or 'snips'.
Researchers from Yale School of Public Health say that people should be screened before using a cell phone, especially as cases of thyroid cancer have been rising in the US and around the world—and the phones could be one unsuspected cause. There are around 53,000 new cases reported every year in the US, with around 2,180 dying from it.
The researchers looked at the biological profiles of over 900 people in Connecticut to discover that those with the genetic variations were more likely to develop thyroid cancer—and the risk doubled if they were regularly using a cell phone.
They add that the risk may reduce with people texting instead of phoning.