03/06/2026
🚨 A recent peer-reviewed case-control study published in Environmental Research provides compelling evidence linking residential exposure to extremely low-frequency magnetic fields (ELF-MF) and prolonged tablet use to an increased risk of central nervous system (CNS) tumors in children under 16.
The research, conducted in Mexico City, compared exposure levels in 200 children diagnosed with CNS tumors (including gliomas and other types, the second most common solid tumors in Mexican children after leukemia) against 793 matched healthy controls.
Researchers measured ELF-MF in the children's bedrooms over 24 hours using gaussmeters, while radiofrequency exposure from devices such as cellphones and tablets was assessed through detailed parental interviews on usage patterns and duration.
Mexico City's dense urban infrastructure contributes to higher-than-average background ELF-MF levels from power lines, electrical wiring, and appliances.
In the study, 5.1% of participants experienced exposures of 0.3 microtesla (μT) or higher, levels that exceed those commonly reported in many other populations.
Key findings include:
• Residential ELF-MF exposure of 0.4 μT or higher in the bedroom was associated with a significantly higher risk of CNS tumors, with an adjusted odds ratio (aOR) of 2.39 (95% CI: 1.15-5.00). This indicates children in high-exposure environments face roughly 2.4 times the risk compared to those with levels below 0.1 μT.
• Prolonged tablet use showed a clear association with increased risk, independent of internet connectivity. Tablets used with an internet connection carried an aOR of 2.53 (95% CI: 1.39-4.61), while offline use was linked to an even higher aOR of 3.53 (95% CI: 1.45-8.59). The association was particularly strong in children aged 6-10.
• Overall cellphone use showed no significant difference between cases and controls, although extended use (more than four years) in children aged 5 and younger raised concern in subgroup analyses.
Children may be especially vulnerable because their developing brains have higher water content, different ion concentrations, and greater electrical conductivity.
These factors allow electromagnetic fields to pe*****te more deeply than in adults, compounded by thinner skulls and smaller head sizes.
The findings align with broader research, including animal studies from the National Toxicology Program that demonstrated clear evidence of cancer from radiofrequency exposure, as well as prior epidemiological work linking ELF-MF to childhood leukemia and other health outcomes.
Experts such as oncologist Lennart Hardell, M.D., Ph.D., have emphasized the need for caution and noted that parental reporting of device use may underestimate actual exposure.
With tablet and device use having increased dramatically, particularly during periods of remote learning, these results merit careful consideration by parents, educators, and public health officials.
Practical steps to reduce exposure include limiting prolonged screen time, preferring wired connections over wireless when possible, keeping devices out of bedrooms, and positioning beds away from electrical outlets or major wiring.
🔗 For the full study abstract and details:
https://www.sciencedirect.com/science/article/abs/pii/S0013935125021103
