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Every week now, Dr. Riina Bray sees two or three new patients with a similar array of ailments and ends up blaming the same, controversial cause.

Suffering from stabbing headaches, “brain fog,” tinnitus or extreme fatigue, their symptoms seem linked to exposure to Wi-Fi routers, cellphone towers and other sources of radio-frequency radiation, says the environmental health specialist at Toronto’s prestigious Women’s College Hospital.

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Dr. Bray’s clinic may be the only mainstream medical facility in Canada that routinely treats patients for a condition known as electromagnetic hypersensitivity. She recently held a seminar to educate physicians about what she calls a major and fast-growing public-health menace, paralleling the explosion of wireless technology in Western society.

“Every year we are getting more and more people coming in,” said Dr. Bray. “I’m very concerned, because the stories are very, very compelling … These are not crazy people. There is a huge, huge problem.”