A panic attack is a brief episode of intense fear. It is accompanied by multiple physical and cognitive symptoms that occur repeatedly and unexpectedly in the absence of any external threat.
Generalised Anxiety Disorder (GAD) affects about 5% of the population. The onset of GAD can be at a relatively early age, with one third of people with GAD experiencing onset in childhood or adolescence.
The word 'phobia' is a derivation of the Greek word 'phobos', meaning flight, which originated from the Greek deity Phobos - whose particular talent was to inspire fear and panic in his enemies.
OCD has been recognised as the fourth most common psychiatric disorder, after phobias, substance abuse and major depression. OCD usually begins in late childhood or early adolescence.