Stress helps?

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A short burst of stress appears to help the body fight off infections, but chronic stress may produce the opposite effect, according to a new report.

After reviewing 300 studies that investigated the link between stress and immunity, a group of researchers found that short-term stress appears to rev up the immune system, while chronic stress produces changes in the body that seem to diminish immune functioning.

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The researcher, who is based at the University of Kentucky in Lexington, US, explained that when we are stressed, our bodies release stress hormones, such as adrenaline and cortisol.
When these hormones are intermittently present during brief periods of stress, they cause the body to release immune cells capable of quickly and efficiently fighting off infections.