Last week on the Jeremy Vine show on BBC Radio 2, a man living in Cornwall described how he suffered when a wireless computer network was introduced into a studio where he was working. Almost immediately he got a terrible headache, started to feel fuzzy and sick, and couldn’t concentrate.

When he and a colleague turned off the Wi-Fi, his symptoms disappeared within minutes. He concluded that the radio waves generated by the Wi-Fi network must have caused his reaction, and has since found he gets the same symptoms in any Wi-Fi hotspot.

We’re surrounded by wireless networks, mobile phone masts and the microwave signals from other electronic equipment, especially with Wi-Fi hotspots springing up around every corner. If you have unexplained headaches, palpitations or a skin rash, you might be susceptible. Or if you have unexplained infertility, this may be the cause.

Make sure you and your partner don’t work with a laptop on your lap or carry mobile phones in your pocket, and avoid standing in front of a microwave oven while it’s in use. If you do have a Wi-Fi network at home, switch it off at night and avoid Wi-Fi hotspots such as inner-city coffee shops.