Mayo Clinic - Stress: Why you have it and how it hurts your health
Mayo Clinic - You've got a big presentation in an hour, but you've hardly had a chance to prepare. Urgent e-mails keep popping onto your display screen, each one sending a stab of anxiety through your chest. As minutes tick by, you search frantically for slides and handouts, knowing your boss will summon you any second. Meanwhile, your heart races and your head pounds.
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