From National Institute of Mental Health (NIMH)

The National Institute of Mental Health (NIMH) is part of the National Institutes of Health (NIH), a component of the U.S. Department of Health and Human Services.

What are Anxiety Disorders?
Anxiety is a normal reaction to stress. It helps one deal with a tense situation in the office, study harder for an exam, keep focused on an important speech. In general, it helps one cope. But when anxiety becomes an excessive, irrational dread of everyday situations, it has become a disabling disorder.

Five major types of anxiety disorders are:

  • Generalized Anxiety Disorder
  • Obsessive-Compulsive Disorder (OCD)
  • Panic Disorder
  • Post-Traumatic Stress Disorder (PTSD)
  • Social Phobia (or Social Anxiety Disorder)

Treatment
Effective treatments for anxiety disorders are available, and research is yielding new, improved therapies that can help most people with anxiety disorders lead productive, fulfilling lives.