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Stress signal no. 1: Breakouts

Persistent pimples are often the result of high anxiety. Indeed, a study conducted at Stanford University Medical School showed that college students had more breakouts in the days surrounding exams than at other times. The reason? As tension mounts, cortisol levels spike, instigating oil production and inflammation and kick-starting the growth of P. acnes, the bacterium responsible for pimples. And while hormone-induced zits typically occur on the chin, stress-related flare-ups can show up anywhere. What's more, although stress pimples don't look much different from any other pimple, they tend to be more stubborn.

Next: How to stop breakouts