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Anxiety is a feeling of unease, such as worry or fear. Everyone has feelings of anxiety from time to time. It is a natural reaction to situations we find threatening or difficult, such as moving house or money problems. Usually anxiety disappears when the situation changes, or if we get used to the situation or can move away from it. But some people become anxious for long periods of time and for no clear reason. This can make life difficult and may affect your work and social life.