Why Is Internal Family Systems (IFS) Therapy Good for Complex PTSD?

By Chris Rudyard, accredited counsellor and psychotherapist, Garston, Liverpool. Last updated October 2026.

Short answer: Internal Family Systems (IFS) is a good fit for complex PTSD (CPTSD) because it works with the whole pattern of how someone adapted to repeated trauma, rather than a single memory. It moves at the person’s own pace, treats protective behaviours such as people-pleasing, numbing or self-criticism as survival strategies rather than symptoms, and builds a calmer relationship with the self. It is not the only effective trauma therapy, and its evidence base is still growing.

What is complex PTSD (CPTSD)?

Complex PTSD develops after repeated or prolonged trauma, often in childhood, such as neglect, emotional abuse or growing up in an unsafe home. It is recognised in the World Health Organization’s ICD-11. As well as the core symptoms of PTSD (flashbacks, hypervigilance, avoidance), CPTSD involves difficulties regulating emotions, a persistently negative sense of self, and problems in relationships.

What is Internal Family Systems (IFS) therapy?

IFS is a psychotherapy model, developed by Richard Schwartz, based on the idea that the mind is made up of different “parts,” and that everyone has them. In trauma, parts often take on extreme roles:

• Protectors work to keep you safe: the perfectionist, the people-pleaser, the hypervigilant part, the part that shuts down.

• Exiles are younger parts that carry the pain, fear and shame of what happened.

• Firefighters step in with intense strategies when that pain surfaces, such as overworking, bingeing, drinking or dissociating.

Underneath these parts, IFS holds that everyone has a core “Self” with qualities like calm, curiosity and compassion. Trauma covers it over but doesn’t destroy it.

Why does IFS suit complex PTSD?

It works with patterns, not just single events. CPTSD is usually about years of experience within relationships that should have been safe. IFS doesn’t need one clear traumatic memory to focus on. It works with how you adapted and the parts still carrying those adaptations.

It goes at a pace your system can tolerate. Going too fast can overwhelm someone with trauma. In IFS, the therapist gets to know the protectors first and asks their permission before approaching painful material. For people whose boundaries weren’t respected in the past, having a “no” honoured is often healing in itself.

It makes sense of dissociation and inner conflict. Feeling pulled in different directions, losing time, or feeling disconnected from your body are common in CPTSD. IFS treats these as protective responses to overwhelm, approached with curiosity rather than something to be removed.

It changes the relationship with the inner critic. Rather than arguing with a harsh inner critic, IFS asks what it is afraid would happen if it stopped. Often it learned to criticise you before anyone else could, as a way of keeping you safe. Once it feels understood, it tends to soften.

It builds a relationship with Self. As protectors relax, clients often describe feeling steadier and more able to stay with their own experience. For people who learned early that closeness wasn’t safe, this inner relationship can be powerful.

What does the research say about IFS for CPTSD?

IFS has a growing research base, including early studies showing improvements in PTSD symptoms, depression and self-compassion. However, it does not yet have the large body of randomised trial evidence behind therapies such as trauma-focused CBT and EMDR, which are the approaches recommended in NICE guidelines for PTSD in the UK. In my own practice I often combine IFS with AEDP, EMDR, Brainspotting, Deep Brain Reorienting and other somatic approaches, depending on what each client needs.

Is IFS right for everyone with CPTSD?

No. Some people prefer a more structured, skills-based approach, especially early on. For some, building stability and safety needs to come before any deeper trauma work. A good therapist will help you decide what fits, and that can change over time.

Frequently asked questions

How long does IFS therapy take for complex PTSD?

There is no fixed length. CPTSD work is usually longer-term than single-incident PTSD, because the focus is on building safety and trust before processing painful material. Many people notice shifts in how they relate to themselves earlier on.

Can IFS be done online?

Yes. IFS works well over video, and I offer both online and in-person sessions.

Do I need to remember my trauma for IFS to work?

No. IFS works with what is present now, including emotions, body sensations and the parts of you that react, so it can help even when memories are patchy or hard to put into words.

Is IFS better than EMDR for CPTSD?

Neither is better for everyone. EMDR has a stronger research base for PTSD, while IFS offers a framework for the relational and self-critical difficulties common in CPTSD. They can also be used together.

How do I find an IFS therapist in Liverpool?

Look for a therapist registered or accredited with a body such as the BACP or NCPS who has specific training in IFS Lv 1,2, or 3 and is a qulaified therapist. I work privately in south Liverpool and online, and you can book through my online profile at any time.

About the author: Chris Rudyard is an accredited counsellor and psychotherapist with over 20 years’ experience, an accredited member of the National Counselling & Psychotherapy Society, and runs a private practice in Garston, south Liverpool. His practice has been audited and passed by the BACP & NCPS. He specialises in trauma therapy using AEDP, EMDR, Internal Family Systems, Brainspotting and Deep Brain Reorienting.