An ever-increasing number of studies has clearly shown various biological and medical effects at the cellular level due to electromagnetic fields, including power–frequency,  radio-frequency and microwaves.

Such fields are present in everyday life, at the workplace, in homes and places of leisure.
The functional impairment electrohypersensitivity (EHS) One of the first observations of a direct effect on the immune system was the finding in the 1980s of persons with the functional impairment electrohypersensitivity (EHS), namely those who claim to suffer from subjective and objective skin- and mucosa-related symptoms, such as itch, smarting, pain, heat sensation, redness, papules, pustules, etc., after exposure to visual display terminals (VDTs), mobile phones, DECT telephones, WiFi equipment, as well as other electromagnetic devices.
Frequently, symptoms from internal organ systems, such as the heart and the central nervous system, are also encountered.
 Persons with EHS experience facial skin symptoms (sensory sensations of the facial skin including stinging, itching, burning, erythema, rosacea), eye irritation, runny or stuffy nose, impaired sense of smell, hoarse dry throat, coughing, sense of pressure in ear(s), tinnitus, fatigue, headache, “heaviness” in the head, sleeplessness, nausea/dizziness, cardiac symptoms and difficulties in concentrating.
In the Cox [14] report on electrical hypersensitivity in the United Kingdom, mobile phone users’ symptoms included headaches (85%), dizziness (27%), fatigue (24%), nausea (15%), itching (15%), redness (9%), burning (61%), and cognitive problems (42%).
For those individuals reporting EHS symptoms in the UK population, the percentage of persons with symptoms from cell phone masts was 18%, DECT cordless phones (36%), landline phones (6%), VDTs (27%), television (12%) and fluorescent lights (18%).
In addition, Fox reported that a questionnaire survey of EHS individuals revealed symptoms of nausea, and of dizziness/disorientation.