After something deeply frightening or harmful, it is normal for the mind and body to take time to recover. Disturbed sleep, being easily startled, replaying what happened, feeling on edge or emotionally raw: these are natural responses to an unnatural experience. For many people they gradually settle, particularly with the support of trusted others and time.

For some, they do not settle. The symptoms persist, intrude into daily life, and begin to feel less like recovery and more like a state that has become stuck. When that happens, it may be a sign that you need additional support.

This page is about Post-Traumatic Stress Disorder (PTSD) and Complex PTSD (C-PTSD): what they involve, how they develop, and what effective treatment looks like. If you are looking for information about the broader effects of difficult or painful life experience, the page on Trauma and Difficult Life Experiences may also be relevant. Therapy for PTSD and Complex PTSD is well evidenced, and this page explains what it involves.

What Is PTSD?

Post-Traumatic Stress Disorder is a recognised psychological condition that can develop following exposure to a traumatic event or events. Traumatic events in this clinical sense are those involving actual or threatened death, serious injury, or sexual violence, whether experienced directly, witnessed, or learned about in relation to someone close.

PTSD is characterised by four clusters of symptoms: intrusion, avoidance, negative changes in thinking and mood, and changes in arousal and reactivity. These are described in more detail in the symptoms section below.

It is important to note that experiencing some of these symptoms in the immediate aftermath of a traumatic event is normal and expected. A diagnosis of PTSD is not usually made until symptoms have persisted for at least one month. Many people recover naturally within that period, particularly when they are able to draw on social support and their usual coping resources. The presence of post-traumatic stress symptoms shortly after a traumatic event is not, in itself, a cause for alarm.

What Is Complex PTSD?

Complex PTSD (C-PTSD) is a related but distinct condition that can develop following prolonged or repeated trauma, particularly where escape was difficult or impossible. This includes childhood abuse or neglect, domestic violence, repeated sexual violence, torture, or prolonged captivity.

C-PTSD shares the core symptom clusters of PTSD but also involves significant difficulties in three additional areas: emotional regulation, sense of self, and relationships. People with C-PTSD often describe a pervasive sense of being permanently damaged, profound shame, difficulty trusting others, and a feeling of being fundamentally different from other people.

C-PTSD has only recently been formally recognised as a distinct diagnosis, and not all clinicians or services will use this term. Where it is present, it typically requires a longer and more carefully paced approach to treatment than single-incident PTSD.

Symptoms of PTSD and Complex PTSD

Symptoms vary considerably depending on the nature and duration of the trauma, the person’s history, and the resources available to them at the time. Not everyone will experience all of the following.

Emotional symptoms

• Intense fear, horror, or helplessness connected to traumatic memories
• Persistent negative emotions including shame, guilt, anger, or grief
• Emotional numbness or a feeling of being cut off from others
• A pervasive sense of threat that does not lift even in objectively safe situations
• In C-PTSD, a deep and enduring sense of shame or of being permanently damaged

Physical symptoms

• A persistently heightened state of physical arousal: easily startled, unable to relax, feeling constantly on guard
• Physiological reactions to reminders of the trauma, including racing heart, shortness of breath, sweating, or nausea
• Physical tension held in the body
• Disrupted sleep, nightmares, and fatigue

Cognitive symptoms

• Intrusive memories of the traumatic event, including flashbacks in which the experience feels as though it is happening again in the present
• Difficulty remembering aspects of the trauma, or a sense that memory is fragmented or incomplete
• Persistent negative beliefs about oneself, others, or the world
• Difficulty concentrating
• In C-PTSD, difficulty making sense of one’s own internal states or emotions, and a distorted or unstable sense of self

Behavioural symptoms

• Avoiding situations, people, places, conversations, or thoughts that serve as reminders of the trauma
• Hypervigilance: scanning environments for threat and difficulty feeling safe in public or unfamiliar places
• Withdrawal from relationships and activities that were previously meaningful
• In some cases, risky or self-destructive behaviour as a way of managing overwhelming internal states
• In C-PTSD, significant and persistent difficulties in relationships, including patterns of conflict, withdrawal, or difficulty trusting others

Understanding the Trauma Response

When faced with overwhelming threat, the brain activates a rapid survival response. Adrenaline is released, the body prepares for fight or flight, and, when neither is possible, a state of freeze or shutdown may occur. In the moment, this response is adaptive and can be life-saving.

The difficulty arises when the nervous system becomes stuck in that state of activation after the threat has passed. Reminders of the trauma, including sounds, smells, physical sensations, or situations that feel similar, can trigger the same response in the present. The body responds as though the danger is still happening, even when it is not.

This is not a failure of will or a character flaw. It is a nervous system response based on what what happened, and how it was experienced. Understanding this can itself be an important part of recovery, particularly for people who carry significant shame about their symptoms.

What Determines Whether PTSD Develops?

Not everyone who experiences a traumatic event develops PTSD. A combination of biological, psychological, and social factors influences how the nervous system responds and recovers.

The nature of the event matters. Trauma involving interpersonal violence, betrayal by a trusted person, or situations of complete helplessness tends to have a deeper impact than trauma involving accidents or natural disasters, though any event can give rise to PTSD in the right circumstances.

Biological factors play a role. A more sensitive nervous system, a prior history of anxiety or depression, or previous trauma can all lower the threshold at which PTSD develops.

What happened after the traumatic event is often as important as the event itself. The availability of support, the response of others, the opportunity to speak about what happened, and the presence of ongoing safety all affect recovery. Trauma that is met with disbelief, minimisation, or silence can compound the original injury.

For complex trauma, early life experience is central. A childhood in which the environment was consistently unsafe, unpredictable, or neglectful shapes the nervous system’s baseline in ways that affect adult responses to stress and threat, and that can make recovery from later trauma more difficult.

When to Seek Help

Some degree of post-traumatic stress is a normal and expected response in the immediate aftermath of a serious or frightening experience. Distressing memories, sleep difficulties, heightened anxiety, and emotional reactivity in the weeks following a traumatic event do not necessarily indicate that PTSD is developing. Many people recover naturally within the first few weeks, drawing on their existing support networks, relationships, and coping strategies.

If symptoms are still significantly present after around one month, it is worth seeking a clinical assessment. At that point, the natural recovery window has typically passed, and symptoms that persist beyond it are less likely to resolve without support. Though, this timeline will of course vary between individuals.

It is also worth seeking help sooner if symptoms are severe, if there is any risk of harm to yourself or others, or if you are finding it very difficult to function in daily life.

Many people delay seeking help because they feel their experience was not serious enough, or because speaking about it feels overwhelming. A skilled trauma therapist will not push you to revisit difficult material before you are ready. Effective trauma therapy begins with building safety and stability, not with immediate exposure to traumatic content.

If you are experiencing distress that feels connected to difficult life experiences more broadly, rather than a specific traumatic event, the page on Trauma and Difficult Life Experiences may be a helpful starting point.

If you are in acute distress, contact your GP as a first step. In a mental health emergency, contact NHS 111 or call 999.

Assessment and Therapy for PTSD and Complex PTSD

PTSD and C-PTSD can respond well to psychological treatment. The evidence base is well established, and effective therapies exist for a range of presentations.

As with all presentations, one of the most important elements of effective treatment is a thorough, individualised formulation: a shared understanding between the person and their therapist of how they specifically have been affected, what symptoms and patterns have developed, and what approach is most likely to be helpful for them. Treatment is not one-size-fits-all, and the right approach will depend on the individual.

Trauma-focused Cognitive Behavioural Therapy (TF-CBT) is one of the most well-evidenced treatments for PTSD, recommended by NICE. It works with the thoughts, meanings, and memories associated with the traumatic experience, helping to process what happened in a way that allows it to be integrated as a past event rather than experienced as an ongoing present threat.

EMDR (Eye Movement Desensitisation and Reprocessing) is also NICE-recommended for PTSD and has a strong evidence base. It uses bilateral stimulation alongside focused attention on traumatic memories to facilitate processing and integration. Many people find that EMDR produces significant reduction in distress, often in fewer sessions than traditional talking therapies.

For C-PTSD and complex trauma presentations, phase-based treatment is the recommended framework. This begins with stabilisation: developing the internal resources, grounding skills, and capacity to tolerate difficult emotional states needed before traumatic material is approached directly. Only once a sufficient foundation of stability has been established does the work move towards processing traumatic experience. Approaches used in this work include CBT or EMDR adapted for complex presentations, parts-based approaches such as schema therapy, Internal Family Systems (IFS), and Transactional Analysis (TA).

Where trauma occurred within close relationships, or where the effects include significant difficulties with trust, identity, or intimacy, attachment-informed and psychodynamic approaches address the relational and developmental dimensions of trauma alongside symptom reduction.

Medication, typically SSRIs, is sometimes used alongside therapy to manage symptom intensity, particularly in the early stages of treatment. This is best discussed with a GP or psychiatrist.

What Does Therapy Involve?

Starting therapy can feel daunting. Here is what you can generally expect.

The first sessions are an opportunity to talk through what has been happening. Your therapist will want to understand your experience in your own terms. There is no pressure to have everything figured out or to explain yourself perfectly.

Together, you and your therapist will think about what you would like to work towards. This becomes the foundation for the work.

Sessions are typically 50 minutes and take place weekly, at least to begin with. Some people find that a short course of therapy, perhaps 8 to 12 sessions, is enough. Others prefer longer-term support. There is no single right answer.

Therapy is a collaborative process. Your therapist will bring knowledge, structure, and care. You bring your own experience, honesty, and a willingness to try new perspectives or behaviours when the time feels right.

Progress is not always linear. There may be weeks that feel harder than others. That is a normal part of the process.

The important thing is that you and your therapist develop a shared understanding, and work together to meet your goals.

There is no obligation to continue once you have started. You have the right to withdraw from therapy at any point.