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Core symptoms:

 Excessive anxiety

 Uncontrollable and excessive worry about a number of different situations

 At least three common symptoms present for at least six months.

Common symptoms:

 Restlessness

 Fatigue

 Poor concentration or mind going blank

 Irritability

 Persistent nervousness or feeling on edge

 Muscle tension

 Sleep disturbance.

When reaching a probable diagnosis, however, it is particularly important that worry is recognised as excessive, not limited to situations that would reasonably lead to worry and is disproportionate to the situation(s).

People with GAD may label themselves as having always been a worrier with worries perceived as uncontrollable and leading to significant distress or impairment in functioning.

Worry is often coupled with an intolerance of uncertainty (IoU), but neither worry nor IoU are unique to GAD, being experienced in many other anxiety disorders. As many patients with GAD consider worrying to be a part of their character, they may seek help or are referred to LICBT services after becoming depressed rather than experiences of anxiety. This can lead to GAD being missed in assessments.