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Further aspects on cellular and cordless telephones and brain tumours.

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Hardell L, Mild KH, Carlberg M. · 2003

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Brain tumors developed 70% more often on the same side of the head where people held analog cell phones.

Plain English Summary

Summary written for general audiences

Swedish researchers studied 1,617 brain tumor patients and compared their cell phone use to healthy controls. They found that people who used older analog cell phones had a 30% increased risk of brain tumors overall, with the risk jumping to 70% when the tumor developed on the same side of the head where they held the phone. The pattern was strongest for acoustic neuromas (a type of brain tumor near the ear), where analog phone users showed a 340% increased risk.

Why This Matters

This Swedish case-control study provides some of the strongest evidence linking cell phone radiation to brain tumors, particularly because it shows a clear dose-response relationship and anatomical correlation. The fact that tumors developed preferentially on the same side of the head where people held their phones strongly suggests a causal relationship rather than coincidence. What makes this research particularly compelling is that it examined real-world exposure patterns over several years, not just laboratory conditions. The higher risks associated with analog phones (which operated at higher power levels than modern digital phones) also supports a biological mechanism. While modern phones emit less radiation than the analog devices studied here, they're used far more frequently and for longer durations than phones were in the late 1990s when this data was collected. The science demonstrates that location matters when it comes to EMF exposure and health effects.

Exposure Information

Specific exposure levels were not quantified in this study.

Study Details

We included in a case-control study on brain tumours and mobile and cordless telephones 1,617 patients aged 20-80 years of both sexes diagnosed during January 1, 1997 to June 30, 2000.

They were alive at the study time and had histopathology verified brain tumour. One matched control ...

In total use of analogue cellular telephones gave an increased risk with odds ratio (OR)=1.3, 95% co...

There was a tendency of a shorter tumour induction period for ipsilateral exposure to microwaves than for contralateral, which may indicate a tumour promotor effect.

Cite This Study
Hardell L, Mild KH, Carlberg M. (2003). Further aspects on cellular and cordless telephones and brain tumours. Int J Oncol 22(2):399-407, 2003.
Show BibTeX
@article{l_2003_further_aspects_on_cellular_2164,
  author = {Hardell L and Mild KH and Carlberg M.},
  title = {Further aspects on cellular and cordless telephones and brain tumours.},
  year = {2003},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/12527940/},
}
PubMed: 12527940

Cited By (193 papers)

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Quick Questions About This Study

Yes, Swedish researchers studying 1,617 brain tumor patients found analog cell phones increased brain tumor risk by 30% overall, while digital phones showed no significant overall increase. The analog phone risk jumped to 70% when tumors developed on the same side as phone use.
Swedish research found people who used analog phones on one side of their head had a 340% increased risk of developing acoustic neuromas (brain tumors near the ear) compared to non-users. This dramatic increase was specific to the side where they held the phone.
Swedish research found cordless phones didn't significantly increase overall brain tumor risk, but they did increase astrocytoma risk by 80% when used on the same side where tumors developed. The pattern was similar to cell phones but weaker than analog phones.
Yes, Swedish researchers found brain tumor risk increased by 4% for each additional year of analog phone use. For astrocytoma tumors specifically, the risk increased 10-11% per year regardless of whether people used analog, digital, or cordless phones on the affected side.
Swedish researchers found brain tumors developed significantly more often on the same side people held their phones, suggesting direct microwave exposure causes tumors. Using phones on the opposite side showed no increased risk, indicating location-specific effects rather than general radiation exposure.