Don't worry about it, and perhaps try and stay away from reading up on diseases for awhile. I find health issues and diseases interesting at times, especially Abnormal Psychology. However, if you read about that stuff to much you will become a Hypochondriac. You'll start to think that alot of the different attributes of illnesses apply to you, even if they don't. So it's better just not to think too much about it, or you'll just freak yourself out needlessly.
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"Sprinkle, sprinkle, little bar, what I wonder is a cat" - Cheese from Foster's Home for Imaginary Friends