Diagnoses

PTSD (Post-Traumatic Stress Disorder)

A psychiatric condition resulting from exposure to severe trauma, characterized by intrusion symptoms, avoidance, hyperarousal, and negative alterations in cognition and mood.

C-PTSD (Complex PTSD)

A disorder resulting from prolonged, repeated trauma (e.g., childhood abuse, captivity). Includes core PTSD symptoms plus emotional dysregulation, chronic negative self-concept, and interpersonal difficulties.

DID (Dissociative Identity Disorder)

Characterized by the presence of two or more distinct personality states (alters) that alternate in controlling behavior, accompanied by recurrent amnesia.

OSDD (Other Specified Dissociative Disorder)

A diagnostic category used when dissociative symptoms cause clinical distress or functional impairment but do not meet the full criteria for DID.

OSDD-1a

Identity states that are less distinct than full alters (for example, parts with less separate sense of self). Amnesia may still be present.

OSDD-1b

Distinct alters with their own characteristics, but without significant amnesia between switches.

PDID (Partial Dissociative Identity Disorder)

A diagnosis in the ICD-11 where a person has one dominant daily personality that is interrupted by non-dominant personality states, usually without the heavy memory loss seen in full DID.

DDNOS (Dissociative Disorder Not Otherwise Specified)

The predecessor to OSDD in older DSM revisions (DSM-IV). Still widely referenced in older clinical literature and discussions.