Anxiety is a natural response to stress. But when you become overly anxious, or anxious too often, anxiety disorder may be the cause.
> More About Anxiety
Everyone feels down sometimes. But if these feelings last for more than a few days or keep coming back, you may ask, “Am I depressed?”
> More About Depression
Sudden feelings of fear that occur without warning and without a “triggering” event, disrupting your daily life, can indicate panic disorder.