What Is EMDR? How It Works and Who It Helps

What Is EMDR?

Eye movement desensitisation and reprocessing (EMDR) is a structured psychotherapy that helps you process distressing memories so they lose their emotional intensity. Unlike traditional talking therapies, EMDR does not require you to talk in detail about the traumatic event or complete homework between sessions. Instead, it uses bilateral stimulation, most commonly guided eye movements, to help your brain reprocess memories that have become "stuck."

EMDR was developed by American psychologist Francine Shapiro in 1987 after she noticed that certain eye movements seemed to reduce the intensity of disturbing thoughts. What began as a clinical observation has since become one of the most researched treatments for post-traumatic stress disorder (PTSD) and is now recommended by both the National Institute for Health and Care Excellence (NICE) and the World Health Organization (WHO) as a front-line treatment for trauma.

The idea behind EMDR is that traumatic memories are stored differently from ordinary memories. When something overwhelming happens, the brain does not process the experience fully. The memory remains vivid, emotionally charged, and easily triggered, as if it is still happening now. EMDR helps the brain complete that processing, so the memory can be stored as a normal part of your past rather than an ongoing source of distress.

How EMDR Works

EMDR follows an eight-phase protocol. This structure is one of its defining features. It is not freeform or exploratory. Your therapist guides you through a clear sequence, and each phase has a specific purpose.

The eight phases

Phase 1: History and treatment planning. Your therapist gathers your history and identifies the memories and experiences that need processing. You do not need to share every detail. Together, you agree on which memories to target and in what order.

Phase 2: Preparation. Your therapist explains how EMDR works and teaches you techniques for managing emotional distress, such as grounding exercises or a "safe place" visualisation. This phase ensures you have the tools to handle anything that comes up during processing. Some people need one or two sessions here. Others need longer, particularly if the trauma is complex or long-standing.

Phase 3: Assessment. You identify a specific target memory. Your therapist asks you to notice the image, the negative belief about yourself that goes with it (for example, "I am not safe"), the emotions you feel, and where you feel them in your body. You also identify the positive belief you would rather hold (for example, "I can handle difficult situations"). This creates a clear baseline before processing begins.

Phase 4: Desensitisation. This is the core processing phase. You hold the target memory in mind while following your therapist's finger with your eyes, or while receiving another form of bilateral stimulation such as tapping on alternate hands or listening to sounds that alternate between your left and right ears. Sets typically last 20 to 30 seconds. Between sets, your therapist checks in and asks you to notice whatever comes up, whether that is a new image, thought, emotion, or physical sensation. You do not need to analyse what arises. The process is designed to let your brain make its own connections. Processing continues until the memory no longer triggers significant distress.

Phase 5: Installation. Your therapist helps strengthen the positive belief you identified in Phase 3, linking it to the original memory. This is about consolidating the shift that has taken place during processing.

Phase 6: Body scan. You think about the target memory and scan your body for any remaining tension or discomfort. If any physical sensations come up, your therapist uses further bilateral stimulation to process them. The aim is for you to be able to recall the memory without a physical stress response.

Phase 7: Closure. Your therapist ensures you feel stable before the session ends. If processing is incomplete, they guide you through the calming techniques from Phase 2. You may be asked to keep a brief log of anything that comes up between sessions, but there is no formal homework.

Phase 8: Re-evaluation. At the start of the next session, your therapist checks how the previous target memory is sitting. Has the distress stayed low? Have new memories emerged that need attention? This phase guides what happens next.

What bilateral stimulation feels like

The most common form is eye movements. Your therapist holds up their fingers or a light bar and asks you to follow the movement with your eyes while holding a memory in mind. It can feel unusual at first, but most people get used to it quickly.

Some therapists use alternative forms of bilateral stimulation. These include tapping alternately on your hands or knees, holding small buzzers that vibrate in each hand, or listening to tones that alternate between ears through headphones. If eye movements feel uncomfortable, your therapist can adjust. The mechanism appears to work regardless of which form of bilateral stimulation is used.

What happens during processing

People report different experiences during EMDR processing. You might notice the memory changing, becoming less vivid or more distant. You might have new thoughts or associations. You might feel emotions shifting, sometimes intensely and sometimes subtly. Some people find that other related memories surface, which your therapist can address in later sessions.

It is normal to feel tired after an EMDR session. The processing can continue after the session ends, and you might notice shifts in how you think or feel about the target memory in the days that follow.

What the Evidence Says

EMDR has a strong and growing evidence base, particularly for PTSD. Here is what the research shows.

The World Health Organization (2013) recommends EMDR as one of only two therapies for PTSD in adults, children, and adolescents (the other being trauma-focused CBT). The WHO guidelines specifically note that EMDR does not require detailed descriptions of the traumatic event, extended exposure to the distressing memories, or homework, making it a distinct alternative to CBT-based trauma treatment.

NICE guidelines (NG116) recommend EMDR as a first-line treatment for PTSD alongside trauma-focused CBT. This recommendation applies to both adults and children. NICE also notes that EMDR should be delivered by a therapist with specific training in the approach.

Chen et al. (2014) conducted a meta-analysis examining the effectiveness of EMDR for PTSD across 26 randomised controlled trials. They found that EMDR significantly reduced PTSD symptoms and was at least as effective as trauma-focused CBT. The analysis also found that EMDR produced faster results in some studies, with fewer sessions needed to achieve comparable outcomes.

Shapiro (2014) published a comprehensive review of the evidence for the Adaptive Information Processing (AIP) model that underpins EMDR. This model proposes that many psychological difficulties arise from unprocessed memories, and that EMDR facilitates the brain's natural healing process by enabling these memories to be properly integrated. While the theoretical model continues to generate debate among researchers, the clinical outcomes are well-established.

It is worth being honest about what the evidence does and does not cover. The case for EMDR and single-event trauma (a car accident, an assault, a specific distressing experience) is very strong. The evidence for complex trauma, where someone has experienced prolonged or repeated traumatic events, is growing but less extensive. For conditions beyond trauma and PTSD, including anxiety, depression, and phobias, there is emerging research but it is not yet at the level where EMDR is a first-line recommendation.

What EMDR Is Good For

Research supports EMDR as an effective treatment for the following:

• PTSD (post-traumatic stress disorder). This is where the evidence is strongest. EMDR is a NICE and WHO first-line recommendation for PTSD arising from single traumatic events such as accidents, assaults, natural disasters, or witnessing violence.
• Complex PTSD. For people who have experienced prolonged or repeated trauma, such as childhood abuse or domestic violence, EMDR can be effective but typically requires more sessions and a longer preparation phase. Your therapist may combine EMDR with other stabilisation techniques.
• Childhood trauma. EMDR is recommended for children and adolescents as well as adults. The protocol is adapted for younger people, but the core approach is the same.
• Distressing life events. Not all distressing experiences meet the clinical threshold for PTSD, but they can still leave a lasting emotional mark. Bereavement, medical procedures, relationship breakdown, or workplace incidents can all be processed with EMDR.
• Anxiety and phobias. There is emerging evidence for EMDR in treating anxiety disorders and specific phobias, though CBT currently has a stronger evidence base for these conditions.

Limitations and Alternatives

EMDR is a powerful approach for trauma, but it is not suited to every situation.

Beyond PTSD, the evidence is still developing. While there is promising research for anxiety, depression, and chronic pain, EMDR is not yet a first-line recommendation for these conditions. If your primary difficulty is not trauma-related, other approaches may have stronger evidence.

Some people find bilateral stimulation uncomfortable. The eye movements or tapping can feel strange, and a small number of people find them distressing rather than helpful. A good EMDR therapist will explain the process clearly beforehand and offer alternatives if one form of stimulation does not work for you.

EMDR requires you to briefly hold distressing memories in mind. While you do not need to describe them in detail, the process does involve deliberately recalling painful experiences. For some people, particularly those with severe dissociation, a period of stabilisation work may be needed before EMDR processing can begin safely.

Complex trauma typically needs more time. If you have experienced prolonged or repeated trauma, a standard course of 6 to 12 sessions may not be sufficient. Your therapist may recommend a longer programme that includes preparation and stabilisation alongside the processing work.

If EMDR does not feel right, trauma-focused CBT is the other NICE-recommended option for PTSD. For broader emotional difficulties, our guide to therapy covers the full range of approaches available.

What to Expect

Session length: EMDR sessions are typically 60 to 90 minutes. The longer session length allows time for the processing phases without rushing. Some therapists offer standard 50-minute sessions, but many EMDR specialists prefer the extended format.

Frequency: Weekly sessions are recommended, particularly during the active processing phases. Consistent contact helps maintain momentum and ensures you are well supported.

Number of sessions: For single-event trauma (one specific distressing experience), 6 to 12 sessions is a typical range. Many people notice significant improvement within 6 sessions. For complex trauma involving multiple or prolonged experiences, treatment is usually longer and may extend to 20 sessions or more, including time for preparation and stabilisation.

Cost: Private EMDR sessions typically cost £80 to £100 per session, reflecting the specialist training required and the longer session length that many EMDR therapists offer.

Professional bodies: The EMDR Association UK is the professional body for EMDR practitioners in the UK. Accredited members have completed approved EMDR training (typically a minimum of 50 hours), meet ongoing supervision requirements, and adhere to the association's code of practice. When choosing an EMDR therapist, it is worth checking whether they are accredited or in the process of gaining accreditation. All therapists on Aligned are also registered with a recognised professional body such as BACP, UKCP, or BABCP.

NHS route: EMDR is available on the NHS for PTSD, usually through specialist trauma services. Access typically requires a GP referral, and waiting times can be long. Private therapy allows you to start sooner and choose a therapist with specific experience relevant to your situation.

How Aligned Can Help

If EMDR sounds like it might be a good fit for you, Ally, our matching agent can help you find a therapist trained in this approach. The matching conversation takes around 10 minutes, and our team will find someone who fits your needs, budget, and location. The service is completely free.

Frequently Asked Questions

Does EMDR actually work?

Yes. The evidence is strong and well-replicated, particularly for PTSD. Both the World Health Organization and NICE recommend EMDR as a front-line treatment for trauma. Research shows it is at least as effective as trauma-focused CBT, and some studies suggest it can produce results in fewer sessions.

Is EMDR just for trauma?

EMDR was developed for trauma and that is where the strongest evidence sits. However, research is expanding into other areas including anxiety, phobias, chronic pain, and grief. If your main difficulty is not trauma-related, EMDR may still be worth exploring, but other therapies may have a more established evidence base for your specific situation.

How is EMDR different from CBT?

Both are evidence-based and NICE-recommended for PTSD, but they work differently. CBT involves talking through your experiences, challenging unhelpful thoughts, and gradually facing feared situations through exposure. It typically involves homework between sessions. EMDR uses bilateral stimulation to help your brain reprocess distressing memories, and does not require you to describe the traumatic event in detail or complete homework. Some people prefer one approach over the other, and some therapists integrate elements of both.

Will I have to relive the trauma?

You will be asked to hold the distressing memory in mind briefly during processing, but you do not need to describe it in detail or relive it fully. EMDR is designed to process the memory at a pace your brain can manage. Your therapist will prepare you thoroughly before any processing begins and will check in with you throughout.

Can EMDR be done online?

Yes. Many EMDR therapists now offer online sessions, using on-screen visual cues for eye movements or self-administered tapping as bilateral stimulation. Research on online EMDR is still developing, but early evidence and clinical experience suggest it can be effective. Some therapists prefer to conduct the first few sessions in person before moving online.

How do I know if my therapist is properly trained in EMDR?

Look for accreditation with the EMDR Association UK. This means the therapist has completed a recognised training programme of at least 50 hours, has supervised EMDR practice hours, and meets ongoing professional development requirements. When you match with Aligned, we check these credentials as part of our process.