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Anxiety disorder
Anxiety disorders are a category of mental disorders characterized by feelings of anxiety and fear, where anxiety is a worry about future events and fear is a reaction to current events.〔 These feelings may cause physical symptoms, such as a racing heart and shakiness.〔 There are a number of anxiety disorders: including generalized anxiety disorder, a specific phobia, social anxiety disorder, separation anxiety disorder, agoraphobia, and panic disorder among others. While each has its own characteristics and symptoms, they all include symptoms of anxiety.〔
Anxiety disorders are partly genetic but may also be due to drug use including alcohol and caffeine, as well as withdrawal from certain drugs. They often occur with other mental disorders, particularly major depressive disorder, bipolar disorder, certain personality disorders, and eating disorders. The term anxiety covers four aspects of experiences that an individual may have: mental apprehension, physical tension, physical symptoms and dissociative anxiety.〔David Healy, ''(Drugs Explained, Section 5: Management of Anxiety )'', Elsevier Health Sciences, 2008, pp. 136–137〕 The emotions present in anxiety disorders range from simple nervousness to bouts of terror.〔 There are other psychiatric and medical problems that may mimic the symptoms of an anxiety disorder, such as hyperthyroidism.
Common treatment options include lifestyle changes, therapy, and medications. Medications are typically recommended only if other measures are not effective.〔 Anxiety disorders occur about twice as often in females as males, and generally begin during childhood.〔 As many as 18% of Americans and 14% of Europeans may be affected by one or more anxiety disorders.
==Classification==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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