Fact check: Electromagnetic hypersensitivity?
Text: Martin Röösli
Some people report being particularly sensitive to electromagnetic fields. Epidemiologist Martin Röösli debates whether cellphone masts and Wi-Fi hotspots are really to blame for their symptoms.
People who suffer from “electromagnetic hypersensitivity” (EHS) attribute nonspecific symptoms including headaches, sleep disorders, nervousness and tingling sensations to radiation sources such as cellphone masts, Wi-Fi networks or electrical installations. The suffering that comes with EHS can be considerable and can severely restrict a person’s everyday life. The phenomenon seems plausible to many people — but what do we know about it from a scientific perspective?
Around half of those affected report that they react to electromagnetic radiation immediately. Statements such as these can be investigated using what are known as “provocation studies,” in which people are exposed either to a real electromagnetic field or to a “sham condition” (placebo). A recently published systematic review of such studies covered a total of 2,857 participants, 476 of whom had EHS. The review concluded that there was no evidence that symptoms are triggered by electromagnetic fields below the regulatory limits. Likewise, another review found no evidence of long-term effects on health.
How does electromagnetic hypersensitivity come about?
How, then, can we explain the symptoms and the fact that those affected are so convinced of a causal relationship? One hypothesis is that people with medically unexplained symptoms go looking for a cause and identify electromagnetic fields as one plausible explanation. When they sense that they’re being exposed to electromagnetism in everyday life, near to a cellphone mast for example, they may focus on their well-being and may become aware of symptoms.
This may lead to what is known as a “nocebo” effect, in which their state of health deteriorates solely due to their negative expectations. Over time, they become increasingly convinced that a causal relationship exists.
What can help those affected?
This is not to say that affected individuals are imagining their suffering. Their symptoms are real, even if electromagnetic fields are not the true cause. This means EHS is treatable. Many of those affected report that their symptoms improve if they avoid electromagnetic fields. Based on current knowledge, this is regarded as a placebo effect – when symptoms improve due to the expectation of an improvement, although the treatment itself has no effect.
A more sustainable approach is to treat the unintentionally learned response pattern — for example, through cognitive behavioral therapy. Psychological treatments often gain little acceptance among EHS sufferers, though, so modern approaches to treatment are broader in scope. As a first port of call, I recommend consulting MedNIS, the Swiss network for medical advice on non-ionizing radiation (www.mednis.ch).
Sources appeared in
Environment International (2024), doi: 10.1016/j.envint.2024.108612
and Frontiers in Public Health (2025), doi: 10.3389/fpubh.2025.1603692
Are you curious about your exposure to cell phone radiation?
The ETAIN 5G Scientist app was developed as part of the ETAIN citizen science study (funded by the EU and the State Secretariat for Education, Research, and Innovation). Based on the quality of the network, the app calculates your personal exposure to electromagnetic fields from cell towers and your own devices. The app also has maps showing cell phone radiation levels. Further information and download: www.etainproject.eu
More articles in this issue of UNI NOVA (May 2026).