The Diagnostic and Statistical Manual of Mental Disorders (DSM) is the handbook used for diagnosis of mental health disorders, and is widely used by health care professionals around the world. For each disorder, the DSM has a description of symptoms and other criteria to diagnose the disorder. The DSM is important, because it allows different clinicians and/or researchers to use the same language when discussing mental health disorders. The first DSM was published in 1952 and has been updated several times after new research and knowledge became available. In 2013, the most recent version of the DSM, the DSM-5, was released. There are a few important differences with its predecessor DSM-IV regarding anxiety disorders. First, Obsessive Compulsive Disorder (OCD) is not part of the anxiety disorders any more, but now has its own category: Obsessive-Compulsive, Stereotypic and related disorders. Second, Post-Traumatic Stress Disorder (PTSD) now also has its own category: Trauma and Stressor-related Disorders.

People with generalized anxiety disorder (GAD) display excessive anxiety or worry, most days for at least 6 months, about a number of things such as personal health, work, social interactions, and everyday routine life circumstances. The fear and anxiety can cause significant problems in areas of their life, such as social interactions, school, and work.
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