Dissociation is a broad term describing a range of upsetting experiences of ‘strangeness’, unreality, unfamiliarity, or disconnection. For example, people with dissociative difficulties may describe feeling as though they are ‘trapped in a bubble’ and far away from the world around them, or as though their own memories are unfamiliar to them. These experiences exist at a low level in people without significant mental health concerns, but for some they can become extreme, chronic, and distressing. Such dissociative disorders are as common as OCD but are far less well-known.