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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.
Stress can produce as many different emotions as it can physical effects, although the situation is complicated by the fact that an emotion may be a result of, or a causative factor in, stress. And once an emotion has developed, it may cause further stress. Two of the most common emotional effects of stress are anxiety and depression. An especially important point is the different roles which the conscious and subconscious play in human emotions. Our conscious perceptions cause stress, and thereby produce emotional problems.