Panic disorder is introduced through a scenario of sudden sweating, trembling, pounding heart and:

1. A panic attack is described by its cluster of bodily symptoms. 2. The scenario is being out with friends when symptoms begin suddenly and inexplicably. 3. You begin sweating and trembling, your heart starts pounding, you have trouble breathing, and you start to feel dizzy and nauseous. 4. The suddenness and the absence of an obvious trigger are as important as the symptoms. 5. Relaxation and a slowed heartbeat are the opposite of what occurs. _Source: OpenStax Psychology 2e (CC BY 4.0), Ch 15 'Psychological Disorders', sections 15.1-15.11_