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Imagine that you've been cast away on a desert island. You live completely alone. You have enough to eat and drink. You have shelter. It may even be quite pleasant. But there's no-one else around. After a while you start to feel that some thing s you're doing may be rather strange. One of the things you're lacking is feedback. No-one is giving you any information about how you're getting on. No-one responding to what you do. Without feedback it is difficult to regulate what you do.

When we are anxious or frightened we may feel sick or get diarrhea. If we are angry or frustrated we can end up with a headache, indigestion or tense, aching muscles. These are fairly common complaints which most people suffer at some time. But how can stress play a part in illness such as heart attack, ulcers or depression?