Everyone feels anxious now and then. It’s a normal emotion. For example, you may feel nervous when faced with a problem at work, before taking a test, or before making an important decision.
Anxiety disorders are different, though. They are a group of mental illnesses, and the distress they cause can keep you from carrying on with your life normally.
For people who have one, worry and fear are constant and overwhelming, and can be disabling. But with treatment, many people can manage those feelings and get back to a fulfilling life.