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Anxiety is a feeling of worry, nervousness, or fear about an event or situation. It is a normal reaction to stress. It helps you stay alert for a challenging situation at work, study harder for an exam, or remain focused on an important speech.
Anxiety is a normal and useful response to potentially stressful or dangerous situations. It increases our awareness of what's going on around us. For most people, anxiety is short lived and normally goes away once the situation has passed.