Clinically reviewed by Dr. Chris Mosunic, PhD, RD, MBA
EMDR therapy isn’t new, but more people are hearing about it than ever. Here's how it works and what the research shows, so you can decide if it’s a fit for you.
Maybe a friend swears EMDR helped her move past something she’d carried for years. Or maybe you came across it online while searching for ways to cope with a memory that still feels heavy. Whether you’ve heard of EMDR but don’t know how it works, or you’re familiar with the approach but skeptical, we’re here to break it all down.
If you’re uncertain, that’s understandable, because EMDR can sound unconventional: you briefly recall a painful memory while following side-to-side stimulation, like tracking a moving target with your eyes. But the research tells a more reassuring story. It’s a well-studied therapy for trauma, and it’s increasingly explored for anxiety and depression, too.
Here’s what EMDR involves, what the research shows, and what a session is like, so you have a clearer picture of whether it might make sense for you.
What is EMDR?
EMDR stands for eye movement desensitization and reprocessing. It’s a structured therapy that helps the brain reprocess distressing memories so they carry less emotional weight. Psychologist Francine Shapiro, PhD, developed it in the late 1980s after she noticed that certain eye movements seemed to ease her own troubling thoughts.
EMDR rests on Shapiro’s adaptive information processing model. The idea is that your brain normally files an experience away, so you can recall it later without feeling like you’re living it again. But a frightening or painful event can interrupt that process, leaving the memory raw and unfiled, still carrying the fear and detail of that moment. That’s why it can resurface later, as vivid as the day it happened.
According to this model, “processing” a memory means helping your brain finish the filing. You don’t forget what happened, and the facts don’t change. What changes is the emotional charge it carries, so recalling it feels less like reliving it and more like remembering it. To help that happen, EMDR uses a technique called “bilateral stimulation.”
What is bilateral stimulation?
EMDR uses a technique called bilateral stimulation. While you hold a difficult memory in mind, a trained therapist guides you through side-to-side stimulation.
Bilateral stimulation can take a few forms:
eye movements that follow your therapist’s fingers
gentle taps that switch between your hands or knees
tones that play in one ear, then the other
There’s a theory behind the side-to-side part, though researchers are still working out exactly why it helps. The leading explanation is about mental bandwidth. Your working memory, the part of your mind that holds what you’re focused on right now, can only handle so much at once. When you track side-to-side movement while recalling a hard memory, the two tasks compete for that limited space. The hard memory tends to feel a little less vivid, and with repetition it can lose its sharp edges, so it feels less overwhelming to hold.
What are the phases of EMDR?
EMDR has eight phases, though they tend to blend together in practice. The early phases cover your history and teach you coping skills, so you feel prepared before any hard memories arise. In the middle phases, you focus on a specific memory while following bilateral stimulation, which is meant to help your brain reprocess it. The final phases check that the memory feels less distressing and help you close out the work safely.
Does EMDR work, and what does it treat?
For PTSD
The evidence is strong for post-traumatic stress disorder (PTSD), a condition that can develop after a frightening or life-threatening event. A Cochrane review (a gold-standard summary of research on a topic) found that EMDR and trauma-focused cognitive behavioral therapy (CBT) both reduce PTSD symptoms. They also outperformed other therapies when researchers checked in after treatment ended. A 2024 review in the Journal of Traumatic Stress identified more than 30 randomized controlled trials supporting EMDR for PTSD in adults and children. Major health organizations, including the World Health Organization, recommend EMDR for PTSD.
However, some guidelines, including those from the American Psychological Association (APA), rate the evidence for EMDR as less certain than for trauma-focused CBT. Researchers also debate exactly why EMDR works.
💙 Read more about how EMDR can help you cope with PTSD.
For anxiety and depression
The picture is more mixed outside PTSD. Early research suggests EMDR may help with anxiety, as one meta-analysis found reduced symptoms of anxiety, panic, and phobia, though the studies were small and varied in quality.
Evidence for depression is emerging as well. Another meta-analysis showed reduced depression symptoms, with the strongest effects in more severe cases. These findings are promising, but they don’t carry the same weight as the PTSD research.
What happens during an EMDR session?
After you and a therapist finish the early phases, you bring a specific memory to mind and notice the thoughts and body sensations that come with it. Then your therapist guides you through the bilateral stimulation while you let your mind go where it goes. You can ask to pause or stop at any time. Unlike many talk therapies, EMDR doesn’t require you to describe the memory in detail.
Sessions usually run 60–90 minutes. Your therapist pauses often to check in on what you noticed. Over several rounds of bilateral stimulation, many people find the memory feels less sharp, even though the facts don’t change. Between sessions, a mindfulness practice, such as slow breathing or a body scan, can help you ease feelings that surface.
💙 Explore Calm's EMDR-Inspired Bilateral: Anxiety, a set of music tracks that alternate gently between your left and right ear. It draws on the bilateral stimulation used in EMDR, though audio-only versions haven’t been studied on their own the way clinical EMDR has. Think of it as a calming complement to therapy, not a replacement for a trained therapist.
How long does EMDR take to work?
The answer varies, since it depends on what you’re working through. For a single, recent trauma, some people notice their symptoms ease within a handful of sessions. More complex or long-standing trauma usually takes longer, sometimes many months. Therapists describe a typical course as 6–12 sessions, though it varies widely from person to person.
Along the way, some people feel worse before they feel better. Painful memories can stir up strong emotions in the short term, which is common and doesn’t mean EMDR isn’t working. Before reprocessing begins, your therapist teaches you coping skills, such as grounding exercises that anchor you in the present, so you have tools to use if those feelings get intense.
💙 Try the 5, 4, 3, 2, 1 practice, a quick way to ground yourself in the present, with Prof. Megan Reitz.
What is EMDR FAQs
What does EMDR stand for?
EMDR stands for eye movement desensitization and reprocessing. It’s a form of therapy that uses bilateral stimulation, such as guided eye movements, to help your brain process distressing memories so they feel less intense. Psychologist Francine Shapiro developed this therapy in the late 1980s.
Can EMDR help with anxiety, or is it only for PTSD?
EMDR may help with anxiety, though PTSD is where the evidence is strongest. The studies on anxiety are smaller and less consistent. If your anxiety is tied to a specific frightening experience, it may be worth asking a therapist whether EMDR fits your situation.
💙 Explore how mindfulness can help you manage your anxiety.
How is EMDR different from talk therapy?
EMDR differs from talk therapy because it doesn’t require you to describe your experience in detail. You’ll still talk with your therapist, especially early on, but the reprocessing happens while you hold a memory in mind and follow bilateral stimulation. Talk therapies like cognitive behavioral therapy (CBT) focus more on examining and reshaping your thoughts out loud.
What are the benefits of EMDR therapy?
The main benefit of EMDR is that it can ease the distress tied to painful memories. For many people with PTSD, that can mean fewer flashbacks and less of that constant, on-alert feeling.
Why is EMDR controversial?
Much of the debate is about why EMDR works, not whether it does. The evidence is strongest for PTSD, with early and more mixed findings for anxiety and depression.
Some studies suggest the eye movements themselves add little. The benefit may instead come from giving your mind a second task while you recall a memory, which can make it feel less vivid and emotionally intense. Other tasks that split your attention may have the same effect.
Certain guidelines, including the APA’s, consider the evidence for EMDR less established than for trauma-focused CBT. None of this takes away from the relief many people find with EMDR. It’s useful context as you weigh your options with a therapist.
Are there side effects of EMDR therapy?
EMDR is generally safe when a trained therapist delivers it, though you may experience some short-term effects. You might feel more emotional or tired between sessions, or have vivid dreams as your brain keeps processing the memory.
These reactions usually pass within a day or two. If they last longer or feel overwhelming, it’s a good idea to tell your therapist, who can adjust the pace with you. Serious side effects are uncommon when a therapist follows the full eight-phase process.
How many EMDR sessions does it take to see results?
The number of sessions you need depends on the memory you’re addressing and how long it has affected you. Some people feel relief after a few sessions, while longer-standing experiences often take more time. A common range is 6–12 sessions, but your timeline may be shorter or longer. Your therapist can give you a better sense of what to expect once they know your history.
Can I do EMDR at home, or does it require a therapist?
Full EMDR needs a trained therapist, so it’s not something to try on your own. A therapist helps you reprocess memories and stay grounded if one feels overwhelming, which matters most with intense trauma.
💙 Mindfulness practices and Calm’s EMDR-Inspired Bilateral: Nervous System Reset program can help you feel calmer at home.
Calm your mind. Change your life.
Mental health is hard. Getting support doesn't have to be. The Calm app puts the tools to feel better in your back pocket, with personalized content to manage stress and anxiety, get better sleep, and feel more present in your life.
Images: Getty
