And being the devil's advocate this time, i think that Dr Google sometimes may be a little alarmist.
If you type Headaches causes (every single person in the world has had a headache at some point of their life) then it shows as one of the possible causes Brain tumor. Really? For an anxious person that could be difficult to handle.
I am not opposed to seeking medical information in internet, as a matter of fact i do it, because doctors seem to be clueless about my case, BUT now I have learned that where to look is very important. I stick to medical studies and institutions pages, instead of forums posts, done by who know who.