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1.
Someone who spends their time searching medical websites for diseases they convince themselves they actually have

Similiar to a hyperchondriac
'Then i went on this website and found out that i actually have diabetes AND chronic fatigue!'
'Dude...you're a cyberchondriac'
by el January 07, 2005
 
2.
a hypochondriac who imagines that he or she has a particular disease based on medical information gleaned from the Internet.
Ever since Kristian turned 40, she has become such a cyberchondriac. Now she spends all her free time looking up her ailments on Web MD.
by locochic March 27, 2009
 
3.
Someone who uses popular social networking site Facebook to openly discuss their health issues / fights with their partner / dramas at work / how fat they are / take a swipe at someone else / whinge about life / announce they're grieving a loss / generally be emo.

Their whingy shit usually takes up a whole bunch of screen space and is generally a repetitive bore to read.
Girl 1: Wow, Amy has become such a cyberchondriac lately, all her status updates are about her wanting attention!
Amy is feelin sick today.. runny nose, headache, flu, dont wanna get outta bed, hatin life since my friend died - gonna miss U bro... still gotta go to work though wow Im such a trooper!

Girl 2: I know! Im so sick of Jess whinging about how fat she is...
Jess is so ova bein so fat!!!
by urbanfan1 September 24, 2009
 
4.
Someone who is convinced that anything that goes wrong with their PC is a result of the newest computer virus. Whether or not they have any information at all to justify this claim.

The common household cyberchondriac is just a retard that doesn't know how to use their computer... And tells themselves (and others) that it is due to "the viruses".

A common misdiagnosis of Cyberchondria is in regards to someone who is simply paranoid and thinks their computer always has viruses. This is incorrect. A simple way to differentiate is that cyberchondriacs only believe they have viruses in regards to the functionality, usability, or otherwise mechanical well being of their PC. A paranoid person always thinks they have viruses regardless if their machine is appearing to work without incidence.
(Joe's computer starts going crazy when he clicks on something)
Rob: "What did you just do?"
Joe: "I don't know," (<--- take note of that phrase) "but my computer keeps going crazy. It's probably because of some new virus."
Bob: "Really?"
(Joe stares forward into space with a blank look on his face that only serves to reveal the absence of any intelligent fraction of a brain, and an IQ below 70.)
Rob: (Whispers to Bob) "It's okay, he's just a cyberchondriac."
by mxysptlik October 03, 2009