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Symptoms & Sensitivity

Nocebo as headache trigger: evidence from a sham-controlled provocation study with RF fields.

No Effects Found

Stovner LJ, Oftedal G, Straume A, Johnsson A. · 2008

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This study found no link between cell phone radiation and headaches, suggesting psychological expectations rather than RF fields cause phone-related head pain.

Plain English Summary

Summary written for general audiences

Norwegian researchers exposed 17 people to cell phone radiation (902.4 MHz) for 30 minutes to see if it caused headaches, comparing real exposure to fake exposure sessions. They found no difference in headache patterns between real and fake exposures, with most headaches being typical tension headaches. The study suggests that headaches people blame on cell phones are likely caused by psychological expectations (the nocebo effect) rather than the radio waves themselves.

Why This Matters

This study addresses one of the most commonly reported symptoms people associate with cell phone use: headaches. The researchers used a rigorous approach, exposing participants to RF fields at levels similar to what you'd experience during a phone call (SAR of 1 W/kg), then carefully analyzed the headache patterns with neurological expertise. What makes this finding significant is that it challenges the widespread belief that RF exposure directly causes headaches. The nocebo effect - where negative expectations create real symptoms - appears to be the more likely culprit. This doesn't mean the headaches aren't real or that people are imagining them. Rather, it suggests that anxiety about EMF exposure, not the exposure itself, may be triggering these symptoms. While this is just one study and the EMF research landscape includes conflicting findings, it highlights the importance of separating genuine health effects from psychologically-driven responses when evaluating EMF risks.

Exposure Details

SAR
1 W/kg
Source/Device
902.4 MHz
Exposure Duration
30 min

Exposure Context

This study used 1 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 1 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)FCC limit is 2 times higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 902.4 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 902.4 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

To investigate the type and location of headache experienced by participants in one provocation study in order to gain insight into possible causes and mechanisms of the headaches.

Questionnaire about headache, indication on figure of location of headache after exposure, interview...

The 17 participants went through 130 trials (sham or RF exposure). No significant difference existe...

This and other similar studies indicate that headache occurring in connection with mobile phone use is not related to RF fields, and that a nocebo effect is important for this and possibly other headache triggers.

Cite This Study
Stovner LJ, Oftedal G, Straume A, Johnsson A. (2008). Nocebo as headache trigger: evidence from a sham-controlled provocation study with RF fields. Acta Neurol Scand Suppl. 188:67-71, 2008.
Show BibTeX
@article{lj_2008_nocebo_as_headache_trigger_2810,
  author = {Stovner LJ and Oftedal G and Straume A and Johnsson A.},
  title = {Nocebo as headache trigger: evidence from a sham-controlled provocation study with RF fields.},
  year = {2008},
  doi = {10.1111/j.1600-0404.2008.01035.x},
  url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0404.2008.01035.x},
}
DOI: 10.1111/j.1600-0404.2008.01035.x

Cited By (46 papers)

Quick Questions About This Study

No, Norwegian researchers found no difference in headache patterns between real 902.4 MHz radiation exposure and fake exposure sessions in 17 participants across 130 trials. Most headaches were typical tension-type headaches unrelated to the radio frequency fields.
The nocebo effect occurs when people develop real headaches simply from expecting cell phone radiation to harm them. This 2008 study found headaches blamed on phones are likely caused by psychological expectations rather than actual radio waves.
No, participants in this controlled study could not distinguish between actual 902.4 MHz radiation exposure and sham exposure sessions. Their headache experiences were identical regardless of whether radiation was present or absent.
Researchers exposed 17 people to 902.4 MHz cell phone radiation for 30 minutes per session, comparing these real exposures to fake exposure sessions to determine if the radiation actually triggered headaches.
No, this study found most participant headaches were compatible with tension-type headaches regardless of radiation exposure. The headache type, location, and side affected showed no significant difference between real and fake exposures.