Panic attack occurs when a person, without danger or significant stressor, develops the anxiety symptoms, such as increased heart rate, sweating, trembling hands, chest tightness, abdominal pain and loose stool, numbness in hands and feet, feeling cold or hot, and headache etc. These symptoms come very abruptly, reaching a peak within 10 minutes.

You can refer to the following website.

What is Panic Disorder?

The source of information is provided by the Hospital Authority Castle Peak Hospital