What is it?
Panic disorder involves recurrent, unexpected panic attacks — sudden surges of intense fear or discomfort that peak within minutes — along with persistent worry about having another attack, or changes in behavior to avoid them.
A single panic attack doesn't mean someone has panic disorder; many people have one or two in their life during high stress. Panic disorder is about the pattern: repeated attacks plus the fear and avoidance that build around them.
okay, but what does that mean?
'Unexpected' means the attacks aren't always triggered by an obvious cause — they can seem to come out of nowhere, which is often what makes them so frightening.