The following are the diagnostic criteria for GAD.
• You experience excessive or exaggerated anxiety and worry, on most days for at least 6 months, about a number of events or activities (such as work or school performance).
• You find it difficult to control the worry.
• Your anxiety and worry are associated with three (or more) of the following six symptoms (with at least some symptoms present for most days for the past 6 months; children don’t need to meet as many criteria).
• restlessness or feeling on edge
• finding yourself easily fatigued
• you have difficulty concentrating or your mind goes blank
• you are irritabile
• you have muscle tension
• your sleep is disturbed (you have difficulty getting to sleep or staying asleep, or your sleep is restless)
Also, for a formal diagnosis it is required that the anxiety, worry, or physical symptoms you are experiencing are causing what we call clinically significant distress or impairment in your social, occupational, or other important areas of functioning.
There are some other criteria which are useful in distinguishing Generalised Anxiety from other conditions. Some of these include for instance, that your anxiety or worry is not about having a Panic Attack (see Panic Disorder), or being embarrassed in a public setting (see Social Phobia), being contaminated (see Obsessive-Compulsive Disorder), gaining weight (as in Anorexia Nervosa), and the anxiety is not related to a recent traumatic event such as in Posttraumatic Stress Disorder (PTSD) or Acute Stress Disorder.
Finally, the symptoms themselves must not occur as a direct result of drug use or a medical condition and it must be present at times when you are otherwise free of other conditions such as a Mood Disorder or a Psychotic Disorder.
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References:
American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders, fourth edition.
Washington, DC: American Psychiatric Association.