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Causes of anxiety

Many researchers think that anxiety disorders are caused by a fault in the 'fear system' which enables us to recognise and react to danger. Although the symptoms vary, all anxiety disorders involve a person getting much more anxious than they need to in reaction to a potential 'threat'. Why are some of us more prone to overreacting in this way? Our individual experiences play a large part, but over-anxiety also seems to run in families. It may be linked to different levels of brain chemicals such as serotonin or noradrenaline.

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