A long-term Swedish study has claimed regular mobile phone use can contribute to an increased risk of developing a brain tumour. 1
The study suggested that using a mobile phone for more than 25 years could treble the very small chance of developing a glioma, the most common form of brain tumour. They also claimed the use of 2G phones for 15-20 years doubled the risk, and smartphone use for 5-10 years could quadruple it.
Researchers contacted every adult in Sweden aged between 20-80 who had a new brain tumour diagnosis between 1997 and 2003, and all cases of people across Sweden aged between 18-75 from 2007 to 2009 to gather their information.
Crucially however, it is worth pointing out that some of these results were based on very small numbers, and so their results may not be accurate. It is also worth noting that other factors were not considered, such as occupational hazard or chemical exposure. The estimated use of phones may also not be reliable, so it is very difficult to say for sure whether mobile phone use is associated with an increased risk.
1 Hardell L, Carlberg M. Cell and cordless phone risk for glioma - Analysis of pooled case-control studies in Sweden, 1997-2003 and 2007-2009 . Pathophysiology. Published October 28 2014
Do mobile and cordless phones raise the risk of brain cancer? Study finds risk is three times higher after 25 years of use . Mail Online, November 12 2014