Electromagnetic radiation from natural sources accompanies life on earth. With the multiplicity of man-made sources of non-ionizing radiation, we witness claims from individuals who believe that exposure to this radiation affects their health. They report that exposure to non-ionizing radiation leads to the manifestation of various non-specific symptoms (such as headaches, vertigo, sleep disturbances, fatigue, problems of concentration, dizziness, nausea, elevated pulse rate, digestive problems) and/or skin problems (redness, itching, burning sensations). The source and type of radiation purported to cause these phenomena differ between individuals. Some report the appearance of the symptoms when they are close to a source of very low frequency radiation, such as power lines or electrical household appliances, while others report experiencing their symptoms in the vicinity of a source of radiofrequency radiation, such as mobile phones or cellular base stations.
This phenomenon is known as Electromagnetic Hypersensitivity (EHS). However, since overall existing knowledge provides no scientific proof that exposure to electromagnetic radiation causes these phenomena, and since the causes of these manifestations and their mechanism of action are unknown, scientists researching this topic have named it Idiopathic Environmental Intolerance to Electromagnetic Fields, or IEI-EMF.
This phenomenon is similar to other non-specific sensitivities, such as Multiple Chemical Sensitivities, related to environmental exposure to low levels of chemicals. This too is characterized by a wide range of non-specific symptoms, not verified toxicologically or physiologically.