I get complaints like that all the time from people who finally realize that we have a cell tower on the roof of the building they live/work.
So I get my Narda RadMan scanner, show them how it works, where it triggers an alarm whenever exposure reaches 12.5, 25, 50, and 100-percent of recommended FCC levels of RF exposure (google up OET Bulletin 56 or OET Bulletin 65, it's a dry read, I warn you), and I take him up every floor, starting from the lobby all the way to the roof,and my RadMan stays silent. That's about when they start questioning whether the batteries work, so then I put the thing six inches in front of the antennas and then it goes off. The point? Cell phones and cell stations don't put out the kind of power necessary to affect health. We keep the footprint of the site small so they're not flooded with trying to handle too many cell phones at one time. The higher the density of phones in a given area, the smaller the footprint. It's not uncommon in urban areas for sites to be within blocks of one another. So to answer the question, no, WiFi and cell phones (the phones themselves transmit with less than 1 watt of power) can't cause these kinds of health problems.
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Since encyclopedia.com isn't working tonight- I thought that cellphones do not use the frequencies of microwaves that cause the thermal excitation of water molecules. I also doubt these are the frequencies which would thermally excite one of the organic compounds found in human skin.
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They don't. I don't know the transmit frequencies of all the carriers, but the lowest I've seen is 700 MHz from a paging company, the highest was 1.8 GHz that Sprint uses, and the 2.5 GHz spectrum that they're holding onto hasn't been used for anything yet. Keep in mind also that microwaves need to generate around 1000 watts of power to thermally excite water molecules.