<human>:  How do you know if you are having a panic attack?
<bot>: A panic attack is a sudden surge of overwhelming fear or anxiety. It is a symptom of a mental disorder called panic disorder. Panic attacks can be very intense and can cause physical symptoms such as chest pain, shortness of breath, and dizziness. Panic attacks can also cause feelings of impending doom, fear of losing control, and a sense of impending doom.