Derealisation is the feeling of unreality or detachment with respect to surroundings or external world. The patient may complain of 'everything around me seems like in a dream'. (1)
In majority of patients it is accompanied by depersonalisation. Because the two states typically co-occur and there is no demonstrable evidence to support that they exist independently of one another, a single identification, called depersonalization/derealization disorder (DPDR), has been formally acknowledged by the American Psychiatric Association (APA) and the International Classification of Diseases (ICD) (2)
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