Disorders in which anxiety (persistent feelings of apprehension, tension, or uneasiness) is the predominant disturbance. there are five types of anxiety disorders, including:

1. Generalized anxiety disorder is characterized by at least six months of a more-or-less constant state of tension or worry not related to any event.
2. Panic disorder is characterized by repeated, unprovoked attacks of anxiety or terror lasting up to 10 minutes.
3. Phobias are irrational, involuntary and overwhelming fears that lead a person to avoid common objects, events or situations, including social situations and being out in public.
4. Obsessive-compulsive disorder is characterized by recurrent, persistent and intrusive thoughts or impulses that the person feels can be controlled by performing repetitive behaviors.
5. Post-traumatic stress disorder is severe stress lasting more than one month caused by being part of or witnessing a traumatic event.