Which of the following is a symptom of an anxiety disorder?

Panic attacks are a hallmark symptom of anxiety disorders. They are characterized by episodes of intense fear or discomfort that reach a peak within minutes, often accompanied by physical symptoms such as rapid heartbeat, sweating, shaking, and feelings of impending doom. This response is part of the body's natural "fight or flight" reaction to stress, but in the case of anxiety disorders, these reactions can occur unexpectedly and without any clear external trigger.

The other options do not align with the symptoms of anxiety disorders. Feeling overly relaxed, sudden bursts of laughter, and extreme confidence generally suggest a more positive emotional state, which is not typical in anxiety disorders. Instead, those experiencing anxiety often face heightened levels of stress and worry, making panic attacks a clear indicator of the condition.