Cellphones are increasingly globally ubiquitous. And like many technologies (for example, microwaves), their increased use has come with health concerns. Among the most prominent is that using cellphones can lead to brain tumors. Most recently, a paper from a team in Sweden has again concluded that the use of cellphones and cordless phones increases the risk for tumors, most specifically glioma, a type of usually malignant brain tumor.
In this study, mobile phone users were 30 percent more likely to develop gliomas. Those who used phones for 25 years or more were 200 percent more likely. These effects are enormous, although they are still small in absolute terms. The chance of developing a brain tumor of this type every year is about 3 in 100,000. The researchers concluded that long-term mobile phone use increases this chance to about 9 in 100,000. That’s still small, but it’s a substantial increase. And this possibility might be enough for many of us to switch to hands-free devices (which avoid these issues because the phone is not against your head).
This team has considered the same questions, and reached the same conclusion, before. And it’s not the only one. The International Agency for Research on Cancer cites mobile phones as a “possible” carcinogen.
However, the supposed cancer-phone link is not without controversy. Somewhat atypically, the disagreement breaks down along methodological lines. The first camp uses what are called “case-control” studies and usually concludes that there is a link between mobile or cordless phones and tumors. The second camp uses observational studies and generally concludes there is absolutely no relationship. So, which is it?
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