Anxiety disorders occur when people have both physical and emotional symptoms. Anxiety disorders interfere with how a person gets along with others and affect daily activities. Women are twice as likely as men to have problems with anxiety disorders. Examples of anxiety disorders include panic attacks, phobias, obsessive-compulsive disorder, and post-traumatic stress disorder (PTSD).

Often the cause of anxiety disorders is not known. 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 other children.

Anxiety disorders often occur with other problems, such as:
* Mental health problems, such as depression or substance abuse.
* A physical problem, such as heart or lung disease. A complete medical examination may be needed before an anxiety disorder can be diagnosed.