It absolutely can. I've been sick twice so far this semester, and stress has been attributed to the cause of it. I've all but been TOLD OUTRIGHT that I needed to drop some classes and take it easy.
There was a really good article posted on fark.com today about the relations of stress and sickness - it basically said that there is scientific evidence (and has been for quite some time) that shows that your immune system shuts down on you when you are overly stressed, causing you to get sick easier.
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"The power of accurate observation is frequently called cynicism by those who don't have it." - George Bernard Shaw
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