Tania Lewis states, "...the internet would seem to represent the ultimate site for disseminating health information to ‘lay’ people...", and she is absolutely right. It seems that anyone can be a doctor these days, that's not to say that doctors will become redundant, as obviously, that would never happen. It does mean that the layman will be able to know more about themselves and their body much easier than before the new media changed everything.
Is this "self-diagnosis" more dangerous than it seems? It could be, indeed. Medical information obtained from an unidentified individual may not always be the most accurate, in fact, it could be completely wrong and have dire results.
I for one, have used the internet to diagnose some minor medical conditions, however, would I rely on it for serious conditions? Probably not.
References
Lewis, T. (2006). Seeking health information on the internet: lifestyle choice or bad attack of cyberchondria? In Media, Culture & Society, volume 28, issue 4: 521-539.