Among the variety of symptoms of General Anxiety Disorder, the most prevalent one is excessive worry and anxiety about events or activities, such as concerns at work or performance at school. If the worrying develops into anxiety attacks that occur more days than not over a period of more than six months, then a General Anxiety Disorder has developed that requires treatment.

In addition to the worry and anxiety, a person suffering from GAD will typically experience at least three of the following six symptoms:

• Restlessness or feeling "keyed up" or "on edge"
• Fatigue and feeling easily run down
• Difficulty concentrating
• Irritability
• Muscle tension
• Sleep disturbance (difficulty falling or staying asleep or unsatisfying sleep).