Anxiety disorders are a group of disorders characterized by anxiety for and avoidance of situations where there is no actual danger. Symptoms associated with anxiety disorders are nausea, muscle tension, feelings of exhaustion, restlessness, agitation, irritability and insomnia.

The anxiety disorders described in DSM-V are separation anxiety disorder, selective mutism, specific phobia, social anxiety disorder (social phobia), panic disorder, agoraphobia, generalized anxiety disorder, substance/medication-induced anxiety disorder, anxiety disorder due to another medical condition, other specified anxiety disorder and unspecified anxiety disorder.

In ICD-10, anxiety disorders are listed under the categories of phobic anxiety disorders and other anxiety disorders, and do not include obsessive compulsive disorder.