Anxiety disorders occur when people have both physical and emotional symptoms. Anxiety disorders interfere with personal relationships with others and affect daily activities. Women are twice as likely as men to have problems with anxiety disorders.

Many people, including children and teenagers, develop anxiety disorders in which many of these symptoms occur when there is no identifiable cause. Many people with an anxiety disorder say they have felt nervous and anxious all their lives. This problem can occur at any age. Children who have at least one parent with the diagnosis of depression are more than twice as likely to have an anxiety disorder than children with nondepressed parents.
Generalized anxiety disorders often occur with other problems, such as depression, substance abuse, obsessive-compulsive disorder, and post-traumatic stress disorder (PTSD). An anxiety disorder also can be caused by a physical problem, such as heart or lung disease. A complete medical examination may be needed before an anxiety disorder can be diagnosed.