Anxiety has been defined as a feeling of fear, dread, or apprehension that arises without a clear or appropriate real-life justification. Some authorities differentiate anxiety from true fear in that the latter is experienced in response to an actual threat or danger, such as those to one's physical safety. Anxiety, on the other hand, may arise in response to apparently innocuous situations, or may be out of proportion to the actual degree of the external stress. Generally, intense, persistent, or chronic anxiety that is not justified in response to real-life stresses, and that interferes with the individual's functioning, is regarded as a manifestation of mental disorder. Anxiety is a symptom in many mental disorders, including schizophrenia, obsessive-compulsive disorders, post-traumatic stress disorders, and so on, but in phobias and other anxiety disorders proper, anxiety is the primary (and frequently the only) symptom. Panic disorder (PD) is a common condition, the cardinal features of which are attacks of unexpected, severe anxiety, accompanied by physical symptoms like palpitations, a choking sensation, tingling, dizziness, and fear of dying or "going crazy".

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American Psychiatric Association.: Anxiety Disorders
Provides educational information about anxiety.
Anxiety and Stress Disorders Institute Of Maryland (ASDI)
Information, treatment and training for excessive worrying, anxiety disorders, stress-related disorders, and post-traumatic disorders.
Anxiety Disorders Association of America
Non-profit organization provides information and support for patients and health professionals, with details of conditions, and lists of resources.
Anxiety Disorders in Children and Adults
Articles on the diagnosis and treatment of separation anxiety, obsessive-compulsive disorder, and agoraphobia.
Anxiety Network International
Comprehensive information and advice on social anxiety (social phobia), panic, and generalized anxiety disorder and their treatment. Includes articles, bookstore, question and answer pages, and related links.
eMedicine Health - Anxiety
Overview of anxiety and its causes, symptoms and treatment.
eMedicine: Anxiety
Clinical report on anxiety disorders and panic attacks - symptoms, differentials, medication, treatment, and workup.
Generalized Anxiety Disorder
Information on symptoms and treatment of anxiety disorder from Massachusetts General Hospital.
HolisticOnline: Anxiety
Information about anxiety and PTSD. Causes and symptoms. The treatments covered include both conventional and alternative/integrative medicine approaches.
International Paruresis Association
Contains information about workshops offered in the United States and in the United Kingdom; individual treatment for this disorder that is offered at the Baltimore, Maryland headquarters; and support groups for people with paruresis.
Lifeline Anxiety Disorder Newsletter
Designed for people, and the families of people, who suffer from the panic brought about by fears, anxieties, and phobias.
Anxiety help, resources, medication, recommended reading and information.
Merck: Anxiety
Information about anxiety and its common causes.
National Anxiety Foundation
An organization for support of those who suffer from anxiety. Descriptions of symptoms and treatments for various anxiety disorders, including OCD, Panic Disorder, PTSD, and Social Phobia.
TAPIR: The Anxiety Panic Internet Resource
Self-help for those suffering from phobias, generalised anxiety and related conditions. Contains news, forums, and advice.
WebMD Anxiety & Panic Disorders Health Center
Features causes, symptoms, diagnosis, and treatment options.

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