It’s normal to feel anxious about moving to a new place, starting a new job, or taking a test. This type of anxiety is unpleasant, but it may motivate you to work harder and to do a better job. Ordinary anxiety is a feeling that comes and goes, but does not interfere with your everyday life.
In the case of an anxiety disorder, the feeling of fear may be with you all the time. It is intense and sometimes debilitating.
This type of anxiety may cause you to stop doing things you enjoy. In extreme cases, it may prevent you from entering an elevator, crossing the street, or even leaving your home. If left untreated, the anxiety will keep getting worse.
Scientific Tracks Abstracts: Journal of Psychology & Psychotherapy