Electromagnetic Hypersensitivity Syndrome (EHS) is a condition in which people are highly sensitive to electromagnetic fields. In an area such as a wireless hotspot, they experience pain or other symptoms.

People with EHS experience a variety of symptoms including headache, fatigue, nausea, burning and itchy skin, and muscle aches. These symptoms are subjective and vary between individuals, which makes the condition difficult to study, and has left experts divided about the validity of such claims.

More than 30 studies have been conducted to determine what link the condition has to exposure to electromagnetic fields from sources such as radar dishes, mobile phone signals and, Wi-Fi hotspots.