“Wireless radiation from cellphones and Wi-Fi causes chronic health problems.”

• The International Agency for Research on Cancer (IARC) classified radiofrequency electromagnetic fields as 'possibly carcinogenic to humans' (Group 2B) in May 2011, based on limited evidence linking heavy mobile phone use to glioma and acoustic neuroma — the classification has not been formally withdrawn.
• The IARC Interphone study found an elevated odds ratio for glioma (~1.40) in the highest decile of cumulative call time, and some case-control studies by the Hardell group in Sweden reported increased glioma risk with long-term heavy use.
• The U.S. National Toxicology Program's $30 million rodent study (2018) reported 'clear evidence' of malignant schwannomas of the heart in male rats exposed to high-level, whole-body GSM/CDMA radiation, plus some evidence of brain gliomas; the Ramazzini Institute reported a similar schwannoma finding at far lower field strengths.
• High-intensity RF exposure unquestionably causes biological harm via tissue heating; this is why exposure limits (FCC, ICNIRP) exist at all, and non-compliant or defective transmitters can in principle exceed them.
• A minority of people report 'electromagnetic hypersensitivity' with real, sometimes disabling symptoms (headache, fatigue, sleep disturbance), and WHO acknowledges the symptoms are genuine even while disputing the attributed cause.
• Some experimental studies report small, measurable effects on EEG patterns and sleep architecture from RF exposure, though the health significance is unestablished.

• Wi-Fi and cellphone radiation is non-ionizing and, at ordinary exposure levels, carries far too little photon energy to break chemical bonds or damage DNA directly; no confirmed non-thermal mechanism of chronic harm has been demonstrated.
• A 2024 WHO-commissioned systematic review of 63 studies across 22 countries (Karipidis et al., Environment International) found no association between mobile phone use — including heavy use and use for 10+ years — and brain or head-and-neck cancers.
• Brain tumour incidence has remained essentially flat in national cancer registries (US, UK, Australia, Nordic countries) across three decades of near-universal mobile phone adoption, which is inconsistent with a meaningful causal effect.
• Large prospective cohorts — the Danish cohort of 358,000 subscribers (BMJ 2011), the UK Million Women Study, and the international COSMOS cohort (2024) — found no increased risk of glioma, meningioma or acoustic neuroma.
• The NTP rodent findings are widely regarded as not translatable: exposures were whole-body, 9 hours/day for 2 years at levels up to 4x the human SAR limit sufficient to raise body temperature; exposed male rats paradoxically lived *longer* than controls, and females and mice showed no clear effect. The FDA reviewed the data and stated it does not support a safety concern for humans.
• Wi-Fi exposure levels are typically hundreds to thousands of times below ICNIRP/FCC limits — a Wi-Fi router delivers a tiny fraction of the RF dose of holding a phone to the head, making 'Wi-Fi causes chronic disease' the weakest version of the claim.
• Dozens of double-blind provocation studies (and systematic reviews of them) show that self-identified electromagnetically hypersensitive individuals cannot detect the presence of RF fields better than chance, and symptoms track belief in exposure rather than actual exposure (nocebo effect).
• Major health and regulatory agencies — WHO, US FDA, FCC, National Cancer Institute, Cancer Research UK, ARPANSA, and the EU SCHEER/SCENIHR committees — all conclude the current evidence does not establish adverse health effects from exposure below international limits.
• IARC Group 2B is a low-evidentiary bar shared with aloe vera extract and pickled vegetables; it denotes a hazard that cannot be ruled out, not a demonstrated risk.

87/100 — the lab’s own confidence in the score above, not a second reading of the claim.

US National Cancer Institutegov · 96 · US Food and Drug Administrationgov · 92 · US Federal Communications Commissiongov · 85 · National Toxicology Program (NIEHS)gov · 93 · BMJ (Frei et al., Danish cohort study)journal · 92 · Cancer Research UKother · 88 · Australian Radiation Protection and Nuclear Safety Agencygov · 90 · ICNIRP RF Guidelines 2020journal · 90 · IARC Monographs classification listgov · 94

• The strongest support is not evidence that ordinary cellphone or Wi-Fi exposure causes chronic illness, but evidence that radiofrequency electromagnetic fields remain scientifically plausible enough to monitor: IARC classified RF electromagnetic fields as Group 2B, "possibly carcinogenic to humans," based mainly on limited human evidence for glioma and acoustic neuroma among heavy cellphone users.
• The U.S. National Toxicology Program reported "clear evidence" of malignant heart schwannomas in male rats and some evidence of brain gliomas after long-term, whole-body 2G/3G RF exposure. However, the exposures were controlled animal exposures, generally higher and not directly comparable to typical consumer cellphone or Wi-Fi exposure.
• The Ramazzini Institute reported increased heart schwannomas in male rats exposed lifelong to 1.8 GHz RF fields at levels intended to resemble environmental base-station exposure, which is notable because it overlaps with the tumor type seen in NTP rats; replication and human relevance remain disputed.
• Some case-control studies, including the INTERPHONE study, found elevated glioma risk estimates in the highest cumulative call-time category, but the authors warned that biases and errors limited causal interpretation and the overall study did not show increased glioma or meningioma risk.

• Major public-health agencies including WHO, FDA, NCI, and ARPANSA state that no adverse health effects have been established from cellphone or Wi-Fi RF exposures that comply with current limits.
• Radiofrequency radiation from cellphones and Wi-Fi is non-ionizing; it does not have enough photon energy to break chemical bonds or damage DNA in the way ionizing radiation can. The well-established hazard at high levels is tissue heating, and exposure limits are designed around that mechanism.
• Large epidemiological evidence has not shown a consistent chronic-disease signal. The Danish nationwide cohort update found no increased brain-tumor risk among mobile-phone subscribers, and NCI notes that population brain-cancer rates have not risen in step with the enormous growth in cellphone use.
• For Wi-Fi specifically, measured exposures are typically far below international limits, and ARPANSA states there is no established scientific evidence that low-level RF exposure from Wi-Fi adversely affects health.
• People who report electromagnetic hypersensitivity can have real symptoms, but blinded provocation-study reviews have not found reliable evidence that RF exposure itself triggers those symptoms.

88/100 — the lab’s own confidence in the score above, not a second reading of the claim.

International Agency for Research on Cancergov · 92 · U.S. National Toxicology Programgov · 90 · Environmental Researchjournal · 84 · International Journal of Epidemiologyjournal · 88 · U.S. Food and Drug Administrationgov · 93 · National Cancer Institutegov · 94 · Australian Radiation Protection and Nuclear Safety Agencygov · 91 · BMJjournal · 90 · Bioelectromagneticsjournal · 86 · International Commission on Non-Ionizing Radiation Protection / Health Physicsjournal · 90

• In 2011, the World Health Organization's International Agency for Research on Cancer (IARC) classified radiofrequency electromagnetic fields as 'possibly carcinogenic to humans' (Group 2B) based on limited evidence from some observational studies regarding a possible association with glioma.
• A 2018 study by the US National Toxicology Program (NTP) found some evidence of heart schwannomas (a rare tumor) in male rats exposed to extremely high, continuous levels of 2G and 3G cell phone radiation over their entire lifespans.

• Wireless radiation from cellphones and Wi-Fi is non-ionizing, meaning it inherently lacks the energy required to break chemical bonds, strip electrons, or damage DNA, which is the primary mechanism by which ionizing radiation (like X-rays) causes cancer.
• The FDA, National Cancer Institute, and World Health Organization all state there is no consistent or credible scientific evidence demonstrating that non-ionizing radiation from cell phones or Wi-Fi causes chronic health problems in humans at everyday exposure levels.
• Decades of epidemiological data show that despite an exponential, widespread increase in global cell phone use since the 1990s, incidence rates of brain cancer and other central nervous system cancers have remained flat.
• The 2018 NTP study on rats involved radiation exposure levels and durations that vastly exceeded what humans experience. The researchers explicitly cautioned that the findings cannot be extrapolated to human cellphone use.
• The IARC's 'Group 2B' classification means there is limited or inadequate evidence of carcinogenicity; this same category includes aloe vera extract and pickled vegetables.

98/100 — the lab’s own confidence in the score above, not a second reading of the claim.

National Cancer Institutegov · 98 · Food and Drug Administrationgov · 95

• The International Agency for Research on Cancer classified radiofrequency electromagnetic fields as “possibly carcinogenic to humans” (Group 2B) in 2011, based on limited evidence linking wireless-phone use with glioma and acoustic neuroma; this category does not establish causation and evidence for other cancers was inadequate.[1]
• Some animal and epidemiological findings have suggested possible associations under particular exposure conditions, but results have been inconsistent and often have not been independently replicated.[2]

• The World Health Organization states that no adverse health effects from low-level, long-term radiofrequency exposure have been confirmed and that current evidence does not confirm health consequences from low-level electromagnetic fields.[3]
• The U.S. National Cancer Institute says evidence to date suggests cellphone use does not cause brain or other cancers, and that no other clearly established dangerous health effects have been identified.[4]
• The U.S. FDA concludes that the weight of scientific evidence has not linked cellphone radiofrequency radiation with health problems, including among children and teenagers.[5]
• The claim covers both cellphones and Wi-Fi and asserts broad chronic health problems, but available evidence does not establish a consistent causal link for such a broad range of conditions; the strongest official conclusions concern lack of confirmed harm at typical low-level exposures.[3][4][5]

94/100 — the lab’s own confidence in the score above, not a second reading of the claim.

International Agency for Research on Cancergov · 96 · World Health Organizationgov · 98 · U.S. National Cancer Institutegov · 98 · U.S. Food and Drug Administrationgov · 97 · Federal Communications Commissiongov · 94 · National Library of Medicinejournal · 90

• IARC classified RF-EMF as Group 2B (possibly carcinogenic to humans) in 2011 based on limited epidemiological evidence for glioma and acoustic neuroma.
• The U.S. NTP reported some evidence of carcinogenic activity (malignant heart schwannomas) in male rats after high, whole-body RF exposures approximating older cell-phone signals.
• Some in-vitro, animal, and observational studies have reported associations with oxidative stress, sperm-quality changes, or self-reported symptoms sometimes labeled electromagnetic hypersensitivity.

• WHO states that no adverse health effects have been established as caused by mobile-phone use; similar conclusions apply to typical Wi-Fi exposures, which are far lower.
• FDA, NCI, and ACS reviews find the weight of human evidence does not show that cell-phone or Wi-Fi RF causes cancer or other chronic disease at everyday levels.
• Large cohort and case-control studies (Interphone, Danish cohort, Million Women Study, COSMOS) have not demonstrated consistent, replicable increases in brain tumors or other chronic outcomes.
• RF from these sources is non-ionizing; accepted effects are thermal, and typical exposures stay well below ICNIRP/FCC limits with no confirmed non-thermal mechanism for chronic disease. Blinded provocation studies do not support EMF as the cause of electromagnetic-hypersensitivity symptoms.

78/100 — the lab’s own confidence in the score above, not a second reading of the claim.

National Cancer Institutegov · 94 · U.S. Food and Drug Administrationgov · 90 · International Agency for Research on Cancergov · 90 · National Toxicology Programgov · 88 · American Cancer Societyother · 85