= Generalized anxiety disorder
<Generalized anxiety disorder> involves persistent, excessive worry across several areas of life that is difficult to control and interferes with functioning. Associated changes can include restlessness, tension, fatigue, <sleep> difficulty or problems concentrating.<Generalized Anxiety Disorder: What You Need to Know by the National Institute of Mental Health>[What is generalized anxiety disorder?; signs and symptoms]{ref}
The breadth and persistence of worry distinguish it from an isolated moment of stress. Similar physical <arousal> can occur in other conditions, so an individual symptom such as a racing <heart> does not by itself identify the disorder.
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