Panic disorder is defined in the DSM-5 as an anxiety disorder. It's based primarily on the occurrence of panic attacks, which are recurrent and often unexpected. Furthermore, there is no other mental disorder that better accounts for the attacks (e.g. social phobia, obsessive-compulsive disorder (OCD) or post-traumatic stress disorder (PTSD).According to the DSM-5, a panic attack is characterised by four or more of the following symptoms:

* Palpitations, pounding heart, or accelerated heart rate
* Sweating
* Trembling or shaking
* Sensations of shortness of breath or smothering
* Feelings of choking
* Chest pain or discomfort
* Nausea or abdominal distress
* Feeling dizzy, unsteady, light-headed, or faint
* Chills or heat sensations
* Paresthesia (numbness or tingling sensations)
* Derealization (feelings of unreality) or depersonalization (being detached from oneself)
* Fear of losing control or “going crazy”
* Fear of dying

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