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Heating and pain sensation produced in human skin by millimeter waves: comparison to a simple thermal model.

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Walters TJ, Blick DW, Johnson LR, Adair ER, Foster KR · 2000

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Millimeter waves cause rapid skin heating and pain at 1.8 W/cm², providing baseline data for understanding 5G frequency effects on human tissue.

Plain English Summary

Summary written for general audiences

Researchers exposed 10 volunteers to high-intensity millimeter wave radiation (94 GHz) for 3 seconds to determine when skin heating becomes painful. They found that pain occurred when skin temperature reached 43.9°C, representing a 9.9°C increase from baseline. The study was designed to help predict pain thresholds for military applications using millimeter wave technology.

Why This Matters

This research provides crucial data on how millimeter wave frequencies affect human tissue, particularly relevant as 5G networks increasingly use these same frequencies (24-100 GHz range). The study used extremely high power densities of 1.8 W/cm² - thousands of times higher than typical 5G exposures - to establish clear thermal pain thresholds. What this means for you is that while the specific power levels tested far exceed everyday exposures, the research demonstrates that millimeter waves penetrate only the top layers of skin and cause rapid heating. The science demonstrates that these frequencies interact differently with human tissue than lower frequency EMF, raising important questions about cumulative exposure effects and sensitive populations, even at the much lower power levels we encounter daily from 5G infrastructure.

Exposure Details

Power Density
1800 µW/m²
Source/Device
94 GHz

Exposure Context

This study used 1800 µW/m² for radio frequency:

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: 1800 µW/m²Extreme Concern - 1,000 uW/m2FCC Limit - 10M uW/m2Effects observed in the Extreme Concern rangeFCC limit is 5,556x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 94 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 94 GHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

The aim of this study is to investigate Heating and pain sensation produced in human skin by millimeter waves: comparison to a simple thermal model.

Cutaneous thresholds for thermal pain were measured in 10 human subjects during 3-s exposures at 94 ...

The threshold for pricking pain was 43.9+/-0.7 degrees C, which corresponded to an increase in surfa...

Taken together, these results support the use of the model for predicting thresholds of thermal pain at other millimeter wave (length) frequencies.

Cite This Study
Walters TJ, Blick DW, Johnson LR, Adair ER, Foster KR (2000). Heating and pain sensation produced in human skin by millimeter waves: comparison to a simple thermal model. Health Phys 78(3):259-267, 2000.
Show BibTeX
@article{tj_2000_heating_and_pain_sensation_1414,
  author = {Walters TJ and Blick DW and Johnson LR and Adair ER and Foster KR},
  title = {Heating and pain sensation produced in human skin by millimeter waves: comparison to a simple thermal model.},
  year = {2000},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/10688448/},
}
PubMed: 10688448

Cited By (123 papers)

View all 123 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, millimeter wave radiation can cause skin pain when it heats tissue sufficiently. Research found that 94 GHz radiation caused pricking pain when skin temperature reached 43.9°C, representing about a 10°C increase from normal body temperature.
Millimeter waves can heat skin tissue, but pain thresholds require intense exposure levels far exceeding normal 5G signals. A 2000 study found skin pain occurred only at 43.9°C, requiring nearly 10 degrees of heating above baseline temperature.
Yes, high frequency millimeter wave radiation directly heats skin tissue. Researchers found that 94 GHz radiation increased skin surface temperature by approximately 10 degrees Celsius before volunteers experienced pain sensations during 3-second exposures.
Millimeter waves can rapidly heat skin tissue, with pain occurring at 43.9°C surface temperature. However, this requires intense exposure levels and significant temperature increases of nearly 10 degrees above normal skin temperature to reach pain thresholds.
Millimeter wave exposure impacts skin through thermal heating effects. Research shows that when skin temperature reaches 43.9°C from 94 GHz radiation, people experience pricking pain sensations, indicating the body's natural protective response to excessive heating.