The specific DSM-5 criteria for generalized anxiety disorder are:
Excessive anxiety and worry (apprehensive expectation), occurring more days than not for at least 6 months, about numerous events or activities (such as work or school performance). What is important here is the duration; the persistence and dysfunction for longer periods rules out adjustment disorder.
The individual finds it difficult to control the worry.
The anxiety and worry are associated with at least three (children require only one symptom for diagnosis) of these symptoms:
Restlessness or feeling "keyed up" or "on edge"
Being easily fatigued
Difficulty concentrating or mind going blank
Sleep disturbance (difficulty falling or staying asleep, or restless, unsatisfying sleep)
The anxiety, worry, or physical symptoms cause clinically significant distress or impairment in social, occupational, or other important areas of functioning.
The disturbance is not attributable to the physiologic effects of a substance (eg, a drug of abuse, a medication) or another medical condition (eg, hyperthyroidism).
The disturbance is not better explained by another mental disorder.
For more on anxiety disorders, read here.
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Cite this: Stephen Soreff. Fast Five Quiz: Generalized Anxiety Disorder - Medscape - Sep 20, 2018.