Electromagnetic hypersensitivity (EHS) is characterized by a "variety of non-specific symptoms, which afflicted individuals attribute to exposure to electromagnetic fields". A more specific term used in medical literature is idiopathic environmental intolerance attributed to electromagnetic fields (IEI-EMF). Other terms for IEI-EMF include electrohypersensitivity, electro-sensitivity, and electrical sensitivity (ES). Idiopathic refers to the fact that the cause is unknown.
Although the thermal effects of electromagnetic fields on the body are established and used (e.g. diathermy), those who are self-described with electromagnetic hypersensitivity report responding to non-ionizing electromagnetic fields (or electromagnetic radiation) at intensities well below the maximum levels permitted by international radiation safety standards.
Symptoms attributed to EHS include headache, fatigue, stress, sleep disturbances, skin symptoms like prickling, burning sensations and rashes, pain and ache in muscles and many other health problems. While the symptoms are a real and sometimes disabling problem for the affected person, there is no scientific basis to link them to electromagnetic field exposure.
The majority of provocation trials to date have found that self-described sufferers of electromagnetic hypersensitivity are unable to distinguish between exposure and non-exposure to electromagnetic fields, and it is not recognized as a medical condition by the medical or scientific communities. Since a systematic review in 2005 showing no convincing scientific evidence for its being caused by electromagnetic fields, several double-blind experiments have been published, each of which has suggested that people who report electromagnetic hypersensitivity are unable to detect the presence of electromagnetic fields and are as likely to report ill health following a sham exposure as they are following exposure to genuine electromagnetic fields, suggesting the cause to be the nocebo effect.
Signs and symptoms
A 2001 survey found that people related their symptoms most frequently to mobile phone base stations (74%), followed by mobile phones (36%), cordless phones (29%), and power lines (27%). The survey was not designed to find any causal connection between electromagnetic field exposure and ill health.
A report from the UK Health Protection Agency said that self-described "electrical sensitivity" sufferers have symptoms that can be grouped into two broad categories: facial skin symptoms and more general, non-specific symptoms across a range of body systems. The facial skin symptoms and their attribution to visual display units was mostly a Nordic phenomenon. The report pointed out that it did not "imply the acceptance of a causal relationship between symptoms and attributed exposure".
Recently a smaller group of people in Europe and in the USA have reported general and severe symptoms such as headache, fatigue, tinnitus, dizziness, memory deficits, irregular heart beat, and whole-body skin symptoms. A 2005 Health Protection Agency report noted an overlap in many peoples symptoms with other syndromes known as symptom-based conditions, functional somatic syndromes, and IEI (idiopathic environmental intolerance). Levitt proposed ties between electromagnetic fields and some of these 20th-century conditions, including chronic fatigue syndrome, Gulf War syndrome, and autism.
Those reporting electromagnetic hypersensitivity will usually describe different levels of susceptibility to electric fields, magnetic fields, and various frequencies of electromagnetic waves (including fluorescent and low-energy lights, and microwaves from mobile, cordless/portable phones), and WiFi with no consistency in the severity of symptoms between sufferers. Other surveys of electromagnetic hypersensitivity sufferers have not been able to find any consistent pattern to these symptoms. Instead, symptoms reflecting almost every part of the body have been attributed to electromagnetic field exposure.
A minority of people who report electromagnetic hypersensitivity claim to be severely affected by it. For instance, one survey has estimated that approximately 10% of electromagnetic hypersensitivity sufferers in Sweden were on sick leave or have taken early retirement or a disability pension, compared to 5% of the general population, while a second survey has reported that of 3046 people who experienced 'annoyance' from electrical equipment, 340 (11%) reported 'much' annoyance. For those who report being severely affected, their symptoms can have a significant impact on their quality of life; with sufferers reporting physical, mental and social impairment and psychological distress.
World Health Organization
Following a study conducted in 2005, the World Health Organization (WHO) concluded that:
EHS is characterized by a variety of non-specific symptoms that differ from individual to individual. The symptoms are certainly real and can vary widely in their severity. Whatever its cause, EHS can be a disabling problem for the affected individual. EHS has no clear diagnostic criteria and there is no scientific basis to link EHS symptoms to EMF exposure. Further, EHS is not a medical diagnosis, nor is it clear that it represents a single medical problem.
Most blinded conscious provocation studies have failed to show a correlation between exposure and symptoms, leading to the suggestion that psychological mechanisms may play a role in causing or exacerbating EHS symptoms. In 2010 Rubin et al. published a follow-up to their 2005 review, bringing the totals to 46 double-blind experiments and 1175 individuals with self-diagnosed hypersensitivity. Both reviews claimed that "no robust evidence could be found" to support the hypothesis that electromagnetic exposure causes EHS, as have other studies. They also concluded that the studies supported the role of the nocebo effect in triggering acute symptoms in those with EHS, although it has been argued that this deduction cannot be made from observational studies, and reports of children exhibiting the symptoms suggest that the nocebo effect may be unlikely in these cases. The Essex provocation study of 2007 received some criticism for its methodology and analysis. In their response the authors noted that their study says nothing about long-term effects, but that those affected often claim to respond to the fields within a few minutes.
Some psychologists have suggested that severely affected EHS people who claim that they are unable to live in a wireless society are, like hermits of ancient times, escaping from the pressures of modern life. In addition, scare stories in the media seem capable of increasing the likelihood of the symptoms ascribed to electromagnetic exposure, although another study questioned the validity of this argument on the grounds that ants’ locomotion also shows adverse effects under electromagnetic exposure.
On the other hand, a few provocation studies have claimed some correlation between exposure and symptoms, where subjects with self-diagnosed EHS have been screened for the frequency and type of exposure to which they are most sensitive. It has been argued that these positive studies suggest that frequency or non-linear effects, proposed in 1979, rather than intensity, are relevant, although this has been disputed. Provocation tests in 1981 suggested a link between use of video terminals and skin rash in sensitive individuals. Some studies have suggested neurophysiological differences between sensitive individuals and controls. This may reflect either a psychophysiological stress response to participating in the study or a more general imbalance in autonomic nervous system regulation. Although effects have been shown in some tests of effects on sleep, there are problems of intra-individual reproducibility. Remediation studies suggest that removal of an electromagnetic environment may remove symptoms for computer workers and phantom limb pain.
Some other types of studies suggest evidence for symptoms at non-thermal levels of electromagnetic exposure. A review in 2010 of ten studies on neurobehavioral and cancer outcomes near cell phone base stations found eight with increased prevalence, including sleep disturbance and headaches. Since 1962 the microwave auditory effect or tinnitus has been shown from radio frequency exposure at levels below significant heating. Studies during the 1960s, among workers in the USSR and Poland with occupational electromagnetic exposure, claimed to show a set of symptoms called the ‘microwave syndrome’. Since 2006 the World Health Organization has reported transient symptoms, such as vertigo, nausea, metallic taste and phosphenes, among workers moving through strong magnetic fields near MRI scanners at non-thermal levels. This has been recognised in the ICNIRP Guidelines of 2010 and 2014, and by the European Directive of 2013 under direct biophysical non-thermal undesired or unexpected health effects, such as stimulation of nerves or sensory organs creating temporary annoyance or affecting cognition or other brain functions. There are some indications of a small subgroup of hyper-sensitive individuals. Other areas under study include sensitivity shown through subliminal or autonomic effects as well as conscious effects. These include increased rates of stroke during geomagnetic events, aurora sensitivity. These effects do not necessarily relate to conscious sensitivity.
Other studies on sensitivity have looked at therapeutic procedures using non-thermal electromagnetic exposure, genetic factors, an alteration in mast cells, oxidative stress, protein expression and voltage-gated calcium channels. Mercury release from dental amalgam and heavy metal toxicity have also been implicated in exposure effects and symptoms. Another line of study has been the nature of hyper-sensitivity or intolerance and the range of environmental exposures which may be related to it. Some 80% of people with self-diagnosed electromagnetic intolerance also claim intolerance to low levels of chemical exposure.
In 2002, some controversy over the causal relationship was demonstrated by the Freiburger Appeal, a petition originated by the German environmental medical lobby group IGUMED, which stated that "we can see a clear temporal and spatial correlation between the appearance of [certain] disease and exposure to pulsed high-frequency microwave radiation", and demanding radical restrictions on mobile phone use. To address some of these concerns, and others, Hocking advised in a 2006 WHO proceedings that the test type and duration should be tailored to the individual, and that washout times are needed to prevent a carry-over effect of previous exposure. However, in 2005 the World Health Organization concluded that there is no known scientific basis for the belief that electromagnetic hypersensitivity is caused by exposure to an electromagnetic field.
Electromagnetic hypersensitivity is not an accepted diagnosis. There are no accepted research criteria other than 'self-reported symptoms', and for clinicians there is no case definition or clinical practice guideline. There is no specific test that can identify sufferers, as symptoms other than skin disorders tend to be subjective or non-specific. It is important first to exclude all other possible causes of the symptoms. Researchers and the WHO have stressed the need for a careful investigation. For some, complaints of electromagnetic hypersensitivity may mask organic or psychiatric illness and requires both a thorough medical evaluation to identify and treat any specific conditions that may be responsible for the symptoms, and a psychological evaluation to identify alternative psychiatric/psychological conditions that may be responsible or contribute to the symptoms.
A WHO factsheet also recommends an assessment of the workplace and home for factors that might contribute to the presented symptoms. These could include indoor air pollution, excessive noise, poor lighting (flickering light) or ergonomic factors. They also point out that "[some] studies suggest that certain physiological responses of [electromagnetic hypersensitivity] individuals tend to be outside the normal range. In particular, hyper reactivity in the central nervous system and imbalance in the autonomic nervous system need to be followed up in clinical investigations and the results for the individuals taken as input for possible treatment."
For individuals reporting electromagnetic hypersensitivity with long lasting symptoms and severe handicaps, treatment therapy should be directed principally at reducing symptoms and functional handicaps. This should be done in close co-operation with a qualified medical specialist to address the symptoms and a hygienist (to identify and, if necessary, control factors in the environment that have adverse health effects of relevance to the patient).
Those who feel they are sensitive to electromagnetic fields generally try to reduce their exposure to electromagnetic sources as much as is practical. Complete avoidance of electromagnetic fields presents major practical difficulties in modern society. Methods often employed by sufferers include: avoiding sources of exposure; disconnecting or removing electrical devices; shielding or screening of self or residence; medication; and complementary and alternative therapy.
The UK Health Protection Agency reviewed treatments for electromagnetic hypersensitivity, and success was reported with "neutralizing chemical dilution, antioxidant treatment, Cognitive Behavioural Therapy, Acupuncture and Shiatsu". It was noted that:
The studies reviewed suffer from a combination of the small numbers of subjects included and the potential variation both within and between study populations. Little information is given as to the attributed exposures of the subjects. These factors limit their general applicability outside the immediate study group. For those studies where detail was available, only two were placebo controlled [Acupunture and nutrition intervention].
It was also noted in the review that success may have more to do with offering a caring environment as opposed to a specific treatment.
A 2006 systematic review identified nine clinical trials testing different treatments for ES: four studies tested cognitive behavioural therapy, two tested visual display unit filters, one tested a device emitting 'shielding' electromagnetic fields, one tested acupuncture, and one tested daily intake of tablets containing vitamin C, vitamin E, and selenium. The authors of the review concluded that:
The evidence base concerning treatment options for electromagnetic hypersensitivity is limited and more research is needed before any definitive clinical recommendations can be made. However, the best evidence currently available suggests that cognitive behavioural therapy is effective for patients who report being hypersensitive to weak electromagnetic fields.
The prevalence of claimed electromagnetic hypersensitivity has been estimated as being between a few cases per million to 5% of the population depending on the location and definition of the condition.
In 2002, a questionnaire survey of 2,072 people in California found that the prevalence of self-reported electromagnetic hypersensitivity within the sample group was 3% (95% CI 2.8–3.68%), with electromagnetic hypersensitivity being defined as "being allergic or very sensitive to getting near electrical appliances, computers, or power lines" (response rate 58.3%).
A similar questionnaire survey from the same year in Stockholm County (Sweden), found a 1.5% prevalence of self-reported electromagnetic hypersensitivity within the sample group, with electromagnetic hypersensitivity being defined as "hypersensitivity or allergy to electric or magnetic fields" (response rate 73%).
A 2004 survey in Switzerland found a 5% prevalence of claimed electromagnetic hypersensitivity in the sample group of 2,048.
In 2007, a UK survey aimed at a randomly selected group of 20,000 people found a prevalence of 4% for symptoms self-attributed to electromagnetic exposure.
A group of scientists also attempted to estimate the number of people reporting "subjective symptoms" from electromagnetic fields for the European Commission. In the words of a HPA review, they concluded that "the differences in prevalence were at least partly due to the differences in available information and media attention around electromagnetic hypersensitivity that exist in different countries. Similar views have been expressed by other commentators."
In 2004, the World Health Organization (WHO) conducted a workshop on electromagnetic hypersensitivity. The aim of the conference was to review the current state of knowledge and opinions of the conference participants and propose ways forward on this issue. The meeting was conducted by the WHO International EMF Project as part of the scientific review process to determine biological and health effects from exposure to EMF. The purpose of these workshops is to bring together expert scientists so that established health effects and gaps in knowledge requiring further research can be identified. EHS has been a particularly contentious issue for a number of years.
In Better Call Saul, Jimmy McGill's brother Chuck has become semi-reclusive and believes he suffers from electromagnetic hypersensitivity. Later in the series, Chuck's disease is shown to be psychosomatic.
- Arthur Firstenberg
- Electromagnetic radiation and health
- List of questionable diseases
- Mobile phone radiation and health
- Multiple chemical sensitivity
- TCO Certification for CRT monitor emission
- Wireless electronic devices and health
- Wi-Fi Safety
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- Better Call Saul: is electromagnetic hypersensitivity a real health risk? , The Guardian (retrieved 7 Oct 2015).
- Better Call Saul's Michael McKean talks Chuck's condition and warns: do not know me too quickly, Radio Times (retrieved 7 Oct 2015).