That's certainly a mouthful. Before anyone gets carried away, let's put a few things straight.
If you never have problems when talking on a phone/smartphone against your ear, or when walking past trasmitters etc. but get headaches when reading from your ipad, you don't have EHS.
I know about the cases - or one prominent case in particular. I've studied myself at the Royal Institute of Technology (KTH). It's a **** shame you can't live in the city nor anywhere near cities or phone masts etc. because of the effects. The effects appear to get worse with more (heavy) exposure, as with the case of a Swedish mobile techonology engineer. In practice you have to move outside of the city with no mobile connectivity, nor electrical devices which emit electrical radiation.
A phone mast was installed in Britain. Suddenly many people were feeling ill and they felt that it was causing problems such as headaches etc. A study was made where the phone mast was turned on and off for periods of weeks, measurements were done and a questioneer was put out. People were suffering equally with or without the mast being on. It had NO correlation with exposure to radiowaves. The only cause that was left ater ruling others out was psychosomatics.
If your problems are limited to an ipad and few odd models, you don't have EHS.
If you claim you have EHS and think this is the cause, then think carefully - because it impacts your life and cause a lot of unneeded stress that may very well be the cause of your ailments. It doesn't, however, mean that any radiation would be the actual cause. If you go posting something like this without reading the symptoms or problem descriptions accurately, with the thought of converting people to the belief that everyone has EHS, and taking no sort of responsibly of what you are saying.. DON'T do it. Self-education is a dangerous thing if you get to choose your sources yourself without objectivity - it only amounts to scaremongering.
Thinking you have/get EHS from an ipad while never having the symptoms before or never having the symptoms of EHS when discontinuing the use of your ipad despite all the emissions around our habitat, you are basically showing disrispect to those who are actually suffering from EHS, always, constantly, no matter how they try to avoid it, and finally resort into moving away from civilisation.
Not of course saying that there couldn't be some on this forum actually suffering from EHS. This, however, is highly unlikely.
Cheers!