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Ionizing radiation, cellular telephones and the risk of brain tumours.

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Hardell L, Hansson Mild K, Pahlson A, Hallquist A · 2001

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Cell phone users showed 142% higher brain tumor risk on the same side of the head where they typically held their phone.

Plain English Summary

Summary written for general audiences

Swedish researchers studied 233 brain tumor patients and 425 healthy controls to examine various risk factors for brain tumors, including cell phone use. They found that people who used cell phones on the same side of their head where tumors developed had a 2.42 times higher risk of developing brain tumors in the areas closest to where phones emit radiation. The study also identified increased risks from occupational radiation exposure and certain chemical industry jobs.

Why This Matters

This 2001 Swedish study represents some of the earliest rigorous research linking cell phone use to brain tumors, and its findings remain significant today. The 142% increased risk for ipsilateral use (same-side as tumor) specifically in brain regions with highest microwave exposure demonstrates a clear biological pattern that can't be easily dismissed as coincidence. What makes this research particularly compelling is that it examined actual tumor locations relative to phone usage patterns, rather than just overall cancer rates. The study's design also controlled for other known risk factors, including occupational radiation exposure from medical and industrial sources. While cell phone radiation levels haven't decreased since 2001, our usage patterns have dramatically intensified, with phones now held closer to our heads for longer periods. The reality is that this early warning, combined with subsequent research showing similar patterns, suggests we should take the precautionary principle seriously when it comes to prolonged cell phone use against our heads.

Exposure Information

Specific exposure levels were not quantified in this study.

Study Details

A case-control study on brain tumours included 233 patients aged 20-80 years and alive at the study time

They had histopathologically verified brain tumour and lived in the Uppsala-Orebro region (1994-1996...

Results are presented for the whole study group, as given here, and for malignant and benign tumours...

All three cases had worked with fluoroscopy. Ipsilateral (same side) use of a cellular telephone increased the risk of tumours in the temporal, temporoparietal and occipital areas, with OR 2.42, 95% CI 0.97-6.05 (i.e. the anatomical areas with highest exposure to microwaves from a mobile phone).

Cite This Study
Hardell L, Hansson Mild K, Pahlson A, Hallquist A (2001). Ionizing radiation, cellular telephones and the risk of brain tumours. Europ J Cancer Prevent 10:523-529, 2001.
Show BibTeX
@article{l_2001_ionizing_radiation_cellular_telephones_2158,
  author = {Hardell L and Hansson Mild K and Pahlson A and Hallquist A},
  title = {Ionizing radiation, cellular telephones and the risk of brain tumours.},
  year = {2001},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/11916351/},
}
PubMed: 11916351

Cited By (163 papers)

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Quick Questions About This Study

Yes, Swedish researchers found that people who used cell phones on the same side of their head where brain tumors developed had a 2.42 times higher risk of developing tumors in areas closest to phone radiation emission compared to non-users.
Cell phone radiation poses the highest brain tumor risk in the temporal, temporoparietal, and occipital areas according to this Swedish study. These anatomical regions receive the most microwave exposure when phones are held against the head during calls.
Yes, this study found chemical industry workers had a 4.10 times higher brain tumor risk, while laboratory workers showed 3.21 times higher risk. The research examined 233 brain tumor patients and 425 healthy controls in Sweden.
Medical diagnostic X-rays of the head and neck region increased brain tumor risk by 64% in this Swedish study. The research found an odds ratio of 1.64, suggesting radiation exposure from medical imaging contributes to tumor development.
This study found physicians had a 6.00 times higher brain tumor risk, though with wide confidence intervals. All three physician cases in the study had worked with fluoroscopy, suggesting occupational radiation exposure increases cancer risk.