panic disorder: essential feature

https://en.wikipedia.org/wiki/Panic_disorder

key word: PAROXYSMAL [Gk. para = beyond + oxys = sharp, pointed] = sudden & uncontrolled, occurring periodically (medicine)dictionary.com], sudden attack, convlusions; periodic worsening of a disease [etymonline.com]

--ICD-10-CM Code F31.0 Panic Disorder (Episodic PAROXYSMAL Anxiety) without Agoraphobia

>"The essential feature is recurrent attacks of SEVERE ANXIETY (panic) which are NOT RESTRICTED to any PARTICULAR situation or set of circumstances and are therefore UNPREDICTABLE."

>"Often the first attacks are triggered by physical illnesses, major stress, or certain mediation."

>Rule Out Depression: "Panic disorder should NOT be given as the main diagnosis if the person has a depressive disorder at the time the attacks start; in these circumstances, the panic attacks are probably SECONDARY TO DEPRESSION."