Having a positive attitude is almost tautologically good for your mental health, and extreme stress can hurt your immune system, but that doesn't mean you should feel like shit for feeling like shit.

"Positive Attitude", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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Having a positive attitude is almost tautologically good for your mental health, and extreme stress can hurt your immune system, but that doesn't mean you should feel like shit for feeling like shit.