Stress can motivate us, but it can also get us down. And though it might just make us feel blue, it can also kill us. It depresses levels of sex hormones and people stressed by deadlines are more likely to suffer heart attacks.
In Japan, karoshi (death by overwork) is said to claim 10,000 lives each year. Meanwhile in Britain last November, the Trades Union Congress, the national trades union organization, released data showing that stress costs the economy £7 billion a year.
With all the understandably negative reports about the effects of stress, it's easy to overlook the fact that the stress response is beneficial. And, like everything else to do with our bodies, the way they work and the way we behave, the stress response evolved through natural selection.