Recurrent, unpredictable attacks of severe anxiety not restricted to any particular situation are:

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Recurrent, unpredictable attacks of severe anxiety not restricted to any particular situation are the defining feature of panic disorder (PD). GAD involves chronic anxiety and excessive worry about a variety of everyday events and activities. OCD is characterized by intrusive and recurrent thoughts, impulses, or images, along with repetitive behaviors or mental acts aimed at reducing anxiety or preventing harm. PTSD is a type of anxiety disorder that occurs following exposure to a traumatic event, and involves symptoms such as intrusive thoughts, avoidance, hypervigilance, and numbing.

Recurrent, Unpredictable Attacks of Severe Anxiety Not Restricted to Any