Hostile and persecutory parts are among the most clinically challenging presentations in DID work. They may threaten the client, threaten the therapist, undermine progress, intensify self-harm, or attempt to end the therapy altogether. Clinicians who have not been trained specifically in this population can find these parts frightening, and the instinct to confront, suppress, or set firm limits is understandable.
It is also, in almost every case, the wrong approach.
Understanding why hostile parts exist and what they are doing is the foundation of effective clinical work with them. These parts are not pathological intrusions from outside the self; they are protective structures that developed in the context of profound danger, often when the client had no other option but to direct threat inward. Working with them requires the same curiosity, warmth, and non-judgement that effective parts work requires across the board.
Understanding the function of hostile parts
Hostile and persecutory parts typically emerge from one of several functional origins:
- Internalised perpetrators. The client has identified with or taken in the perpetrator's voice, beliefs, and behaviours as a way of maintaining an attachment to an abusive caregiver. The hostile part carries the perpetrator's messages: "You are worthless," "You deserve to be hurt," "No one will believe you." This is not imitation — it is survival. If the child could not escape the abuser, internalising their voice was a way of feeling some control over the threat.
- Protection through control. Some hostile parts use aggression or self-harm as a way of maintaining control over what feels like an unbearable situation. If the client is at risk of disclosing trauma, the hostile part may intervene with self-harm to prevent it. If the therapeutic relationship feels too close, the hostile part may attempt to rupture it. The hostility is purposeful: it is preventing what this part perceives as greater danger.
- Extreme shame and self-hatred. Parts that carry core schemas of defectiveness and shame may direct intense self-hatred outward or internally against other parts. They have internalised the belief that the self is fundamentally bad, and their actions are consistent with this belief.
- Fight response fixed in trauma time. Parts organised around fight responses from the original trauma may continue to perceive threat in the present environment, including from the therapeutic relationship itself. Their aggression is an appropriate response to the threat they are still experiencing — they are not in 2026; they are still in the moment of danger.
Clinical principle: Every hostile or persecutory part is doing something that made sense at some point. The clinical task is to understand what it is doing, acknowledge the need it is meeting, and over time offer alternatives that meet the same need more adaptively. This is not a quick process.
What does not work
Confrontation. Asking the client to "tell that part to stop" or setting limits on what parts are "allowed" to do during sessions consistently fails and damages the therapeutic relationship with the wider system. Other parts observe how the therapist treats the hostile part, and they draw conclusions about whether the therapist can be trusted. A therapist who treats a hostile part with contempt or impatience signals to the whole system that not all parts are welcome.
Suppression. Attempting to suppress a hostile part through distraction, skills, or pushing through often intensifies its activity. The suppression confirms its belief that it will not be heard or respected, and its behaviour typically escalates.
Reassurance without understanding. "I know that part seems scary but it cannot actually hurt you" misses the function entirely. The part is not acting randomly. Offering reassurance without engaging with the function of the behaviour leaves the part unseen and the behaviour unchanged.
Alliance risk: A rupture with a hostile part can feel like a rupture with a single part, but it is rarely experienced that way systemically. Other parts observe the interaction. If the therapist reacts with frustration, discomfort, or suppression, the rupture often ripples through the system in ways that take significant time to repair.
What does work
Curiosity first, always
Before any intervention, pause and get curious. What is this part doing right now, and what might it be trying to achieve? Even if you cannot ask the part directly in the session, holding this question internally changes your affect and posture in ways the client can feel.
When it is possible to communicate with the hostile part, keep language simple, non-challenging, and warm. "I notice you're here. I'm glad you came. I'd like to understand what's happening for you right now." Not: "I need you to stop that." The difference in what those messages communicate systemically is significant.
Find the need beneath the behaviour
Schema Therapy's affect-to-need mapping is particularly useful here. Hostility often covers fear, shame, or a need for control. The question to work toward — directly with the part when possible, indirectly when not — is: What is this part afraid would happen if it stopped doing this? What does it need? What would it need to feel safe enough to behave differently?
This is not a conversation that happens in one session. Building enough relationship with a hostile part for it to reveal its underlying need takes time and consistent, non-reactive engagement.
Acknowledge the function explicitly
Direct acknowledgement of what the part is doing can shift things significantly. "I can see that you've been working really hard to keep [client name] safe. That job has been exhausting." This does not condone self-harm or threatening behaviour; it recognises the intention behind it. Parts that feel seen often reduce their intensity, even temporarily, in ways that create space for further engagement.
Work with the wider system in parallel
While direct engagement with the hostile part is important, parallel work with other parts of the system matters equally. Other parts may have information about what triggers the hostile part, what it needs, or what its history is. Building a system-wide picture reduces the isolation and misunderstanding that often sustains hostile part behaviour.
Safety planning for the whole system
Safety planning with dissociative clients must explicitly include hostile and self-harming parts. A safety plan that only covers the ANP is insufficient. Identifying which parts feel safe, which feel at risk, and which may actively work against safety allows for a more complete and realistic plan. Internal agreements — negotiated between parts in session — are more durable than external commitments made only by the presenting part.
When escalation occurs
When a hostile part escalates significantly in session, the priority is grounding the ANP and returning to dual awareness before any further parts work. This is not the moment for curiosity about the hostile part; it is the moment for containment and stabilisation. After stabilisation, the clinician can acknowledge what happened and express interest in understanding the part's experience of the escalation — from a position of safety, not in the midst of it.
Repeated escalation that cannot be contained suggests that Phase 1 stabilisation has not yet been sufficiently established, and that returning to Phase 1 goals is clinically indicated. This is not a failure; it is accurate reading of the system's readiness.
Supervision and consultation
Work with hostile and persecutory parts is demanding. Countertransference responses are significant and range from fear and avoidance to overcorrection in the form of excessive accommodation. Regular supervision with someone experienced in DID is not optional in this work — it is a clinical necessity. The therapist's internal response to these parts is clinical data that, without supervision, may go unexamined and shape the work in ways that are not helpful.
Key references
- Kluft, R.P. (2006). "Dealing with alters: A pragmatic clinical perspective." Psychiatric Clinics of North America, 29(1), 281-304.
- Nijenhuis, E.R.S., & van der Hart, O. (2011). "Dissociation in trauma: A new definition and comparison with previous formulations." Journal of Trauma and Dissociation, 12(4), 416-445.
- Schwartz, R.C. (2021). No Bad Parts: Healing Trauma and Restoring Wholeness with the Internal Family Systems Model. Sounds True.
- Steele, K., van der Hart, O., & Nijenhuis, E.R.S. (2005). "Phase-oriented treatment of structural dissociation in complex traumatization: Overcoming trauma-related phobias." Journal of Trauma and Dissociation, 6(3), 11-53.
- van der Hart, O., Nijenhuis, E.R.S., & Steele, K. (2006). The Haunted Self: Structural Dissociation and the Treatment of Chronic Traumatization. Norton.
- Young, J.E., Klosko, J.S., & Weishaar, M.E. (2003). Schema Therapy: A Practitioner's Guide. Guilford Press.
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