Disordered Plurality

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Disordered plurality is an umbrella term for all experiences of plurality that cause or strongly affect "significant difficulty, distress, impairment, and/or suffering in a person's daily life." If a system doesn't consider their plurality to have a large negative impact on their life, they're not disordered. Being plural is not a disorder on its own, but there is a large overlap between plural and disordered experiences.

The most known form of disordered plurality is Dissociative Identity Disorder (DID), formerly Multiple Personality Disorder (MPD). Accompanying that are Otherwise Specified Dissociative Disorder (OSDD) / Unspecified Dissociative Disorder (UDD), formerly Dissociative Disorder Not Otherwise Specified (DDNOS), and Partial Dissociative Identity Disorder (P-DID). Neurogenic plurals are typically disordered, even if they don't have DID or a related disorder, as their plurality is tied to other disorders they have.

Disordered plurals typically experience dissociative symptoms such as derealization, depersonalization, and dissociative amnesia. Heavy dissociation is generally viewed as originating in trauma, leading to the association with traumagenic systems, but systems may experience trauma separately from their origins, and it is possible to dissociate heavily without a traumatic origin for it.