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Local vasodilator response to mobile phones.

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Paredi P, Kharitonov SA, Hanazawa T, Barnes PJ · 2001

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Cell phone radiation causes immediate tissue heating and blood vessel changes during 30-minute calls, effects that disappear with hands-free use.

Plain English Summary

Summary written for general audiences

Researchers measured how 30-minute cell phone conversations affected nasal passages and skin temperature in 11 healthy adults. They found that the phone side of the face heated up by over 2 degrees Celsius, nasal passages narrowed by 27%, and nitric oxide levels increased, indicating blood vessel dilation. These effects disappeared when participants used a hands-free earpiece, proving the electromagnetic field was the cause.

Why This Matters

This study provides clear evidence that cell phone radiation produces immediate, measurable biological effects in human tissue. The 2.3-degree temperature increase and 27% reduction in nasal airway area demonstrate that 900 MHz radiation penetrates tissue and triggers vascular responses within minutes of exposure. What makes this research particularly compelling is the control element: when participants used earpieces to avoid direct EMF exposure, these effects vanished entirely. The science demonstrates that these aren't psychological effects or coincidences, but direct biological responses to electromagnetic fields. While the researchers focused on acute effects during a single 30-minute call, the reality is that many people spend hours daily with phones pressed against their heads. The vasodilation response they documented suggests your body is actively responding to this radiation exposure every time you take a call without a hands-free device.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 900 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 900 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. The study examined exposure from: 900 MHz Duration: 30-minute telephone conversation

Study Details

We investigated if a mobile telephone conversation can modify skin temperature, NO, and nasal resistance.

We studied the effect of an EMF (900 MHz) generated by a commercially available cellular phone durin...

There was a similar and significant increase in skin temperature of the nostril and occipital area o...

Exposure to EMF produced by a mobile phone produces biological effects that can be easily measured. Microwaves may increase skin temperature and therefore cause vasodilation and reduce MCA. Further studies are needed to study the long-term effects of mobile phone use and the relation among NO production, vasodilation, and temperature.

Cite This Study
Paredi P, Kharitonov SA, Hanazawa T, Barnes PJ (2001). Local vasodilator response to mobile phones. Laryngoscope 111(1):159-162, 2001.
Show BibTeX
@article{p_2001_local_vasodilator_response_to_1697,
  author = {Paredi P and Kharitonov SA and Hanazawa T and Barnes PJ},
  title = {Local vasodilator response to mobile phones.},
  year = {2001},
  doi = {10.1097/00005537-200101000-00027},
  url = {https://onlinelibrary.wiley.com/doi/abs/10.1097/00005537-200101000-00027},
}
DOI: 10.1097/00005537-200101000-00027

Cited By (48 papers)

Quick Questions About This Study

Yes, cell phone radiation can cause blood vessel dilation. A 2001 study found that 30-minute phone calls increased nitric oxide levels and caused facial blood vessels to dilate, heating skin by over 2 degrees Celsius on the phone side.
Phone radiation significantly affects nasal breathing by narrowing air passages. Research showed that 30-minute cell phone use reduced nasal airway area by 27% on the phone side, while the opposite side actually improved by 38%.
Cell phone radiation causes measurable heating of facial skin during calls. Studies demonstrate that 900 MHz radiation from phones increases skin temperature by over 2 degrees Celsius within 6 minutes of use on the exposed side.
Cell phones alter blood flow patterns by causing blood vessel dilation on the side of phone use. This vasodilation effect, measured through increased nitric oxide levels, occurs within 10 minutes of starting a phone call.
Cell phone exposure raises local body temperature significantly during calls. Research shows that 30-minute phone conversations heat facial skin and nasal areas by over 2 degrees Celsius, with effects disappearing when using hands-free devices.