Again, in some jurisdictions, it differs, but at least in Arizona, the legal test is, were you too sick to know right from wrong?

NPR: Slate's Jurisprudence: Moussaoui's Insanity Defense

With the advent of flu season, it can be tough to know what to do when you know you are too sick to go to work, but are worried about the repercussions of skipping a day.

CNN: Food workers, nurses forced to work sick

Too much stress will make you sick.

BBC: Dealing with anger

If you come in sick, there's a good chance your co-workers and customers will get sick, too -- and in some cases, passing on your illness can cause potentially life-threatening situations.

CNN: Food workers, nurses forced to work sick