Is EMDR Therapy Dangerous? Understanding Risks, Side Effects, and How to Stay Safe
A balanced, evidence-based look at the dangers, risks, and side effects of EMDR therapy, including contraindications, warning signs, and how to reduce your risk of harm.
Is EMDR Dangerous? The Bottom Line
EMDR therapy is generally considered safe and is recommended as a first-line treatment for post-traumatic stress disorder by the World Health Organization and the American Psychological Association. For most people, the risks are limited to short-term, manageable side effects like vivid dreams, emotional intensity, and fatigue in the day or two after a session.
That said, EMDR is not risk-free, and it is not appropriate for everyone. When delivered by an inadequately trained clinician, used outside of standard protocol, or attempted before a person has the stabilization skills to handle trauma activation, EMDR can intensify distress, trigger dissociation, or temporarily worsen symptoms. The most serious risk is retraumatization, which is rare in well-structured treatment but real enough that the eight-phase EMDR protocol exists specifically to prevent it.
The honest answer is this: EMDR is safer than the conditions it treats for the right patient, with the right therapist, at the right time. The danger lies not in the technique itself but in skipping the preparation, ignoring contraindications, or rushing into reprocessing before someone is ready.
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How EMDR Works and Why Side Effects Occur
Eye Movement Desensitization and Reprocessing is a structured, eight-phase therapy developed by Francine Shapiro in the late 1980s. It uses bilateral stimulation — typically guided eye movements, alternating taps, or audio tones — while a client briefly recalls a distressing memory. The current leading theory is that bilateral stimulation taxes working memory, which loosens the emotional charge attached to a memory and allows the brain to re-encode it in a less distressing form.
In plain terms, EMDR helps your brain finish processing experiences that got stuck. That processing is the goal, but it is also the source of most side effects. Reprocessing a traumatic memory temporarily activates the same nervous-system pathways that the memory originally engaged. You may feel the emotion, hear the internal narrative, or notice physical sensations connected to the event. For most people, this activation peaks during the session and fades over the next 24 to 72 hours.
Side effects are not a sign that EMDR is hurting you. They are usually a sign that your brain is working through material that was previously frozen. The risk arises when that activation is more intense than your nervous system can handle in the moment — which is why preparation, pacing, and clinician skill matter so much.
Common Side Effects: What's Normal and When to Worry
The vast majority of EMDR side effects fall into a predictable, time-limited pattern. Knowing what to expect makes it easier to distinguish a normal response from a warning sign.
Common, Short-Term Side Effects
- Vivid or unusual dreams. The brain often continues reprocessing during REM sleep. Dreams may be intense or fragmented for two to five nights after a reprocessing session.
- Emotional volatility. Sudden tearfulness, irritability, or waves of sadness, anger, or anxiety in the 24 to 72 hours after a session. Most people describe this as feeling raw or thin-skinned.
- Headaches and fatigue. Mild headaches, jaw tension, or unusual tiredness are common, likely reflecting the physical and cognitive load of an active session.
- Unexpected memories surfacing. Related memories, including ones you had not consciously connected to the target, may pop up between sessions. This is normal associative processing.
- Brief flashback or intrusive imagery. Short, low-intensity flashes of the target memory or related imagery. These typically fade within hours.
- Physical sensations. Some clients report transient dizziness, nausea, tingling, or a sense of heaviness, especially when the target memory had a strong somatic component.
- Light dissociation. Feeling spacey, floaty, or briefly disconnected. Mild dissociation that resolves the same day is generally not concerning.
These effects typically resolve within 24 to 72 hours and lessen over the course of treatment as your nervous system gets better at processing without flooding.
Warning Signs That Need Attention
Some reactions cross from normal processing into territory that needs adjustment. Contact your therapist if you experience any of the following:
- Symptoms that intensify rather than fade after 72 hours
- Dissociation that lasts more than a few hours or interferes with safety
- New or worsening suicidal thoughts
- Inability to sleep for more than one night
- Severe flashbacks that feel as vivid as the original event
- Self-harm urges, substance use relapse, or behaviors that compromise stability
- Symptoms that prevent you from working, parenting, driving, or functioning safely
None of these mean EMDR cannot work for you. They mean the pace, target, or preparation needs to be adjusted before reprocessing continues. For a deeper look at typical reactions, see our companion guide on EMDR side effects.
Who Should Not Try EMDR? Contraindications and Special Considerations
EMDR has fewer hard contraindications than many people assume, but there are situations where it should be delayed, modified, or paired with other treatment. A trained EMDR therapist will screen for these during the history-taking phase before any reprocessing begins.
Active Substance Use Disorder
If you are actively misusing alcohol or drugs in a way that impairs functioning, reprocessing trauma can trigger relapse or escalate use. Most EMDR therapists require a period of stability or active substance-use treatment before starting reprocessing. Substance use that has been stable for several months may not be a barrier, especially with concurrent recovery support.
Untreated Psychotic Disorders
Active, untreated psychosis is generally a contraindication for standard EMDR. The bilateral stimulation and dual-attention task can be destabilizing for someone whose reality testing is already compromised. Adapted EMDR protocols exist for people with psychotic disorders, but they require specialized training and usually pair EMDR with psychiatric care and medication management.
Severe Dissociative Disorders
People with dissociative identity disorder or other-specified dissociative disorder need a modified, slower EMDR approach. Standard reprocessing can trigger dissociative switching or overwhelming flooding without specialized preparation. Look for a clinician with explicit training in EMDR for dissociative disorders, and expect a longer stabilization phase before any trauma processing.
Acute Crisis or Ongoing Abuse
EMDR is not appropriate during an acute crisis or while you are still being actively harmed. Reprocessing requires that the trauma be in the past, with enough safety in your present life to integrate the work. If you are in a domestic violence situation, in active suicidal crisis, recently bereaved, or otherwise in survival mode, stabilization and safety planning come first.
Serious Medical Conditions
Certain medical conditions warrant medical clearance before EMDR. These include uncontrolled seizure disorders (the rhythmic eye movements can theoretically trigger seizures in vulnerable individuals), severe cardiac disease (because of the emotional and physiological intensity), recent stroke, severe glaucoma or retinal conditions, and pregnancy with complications. Most clinicians will pause and check with your physician rather than rule EMDR out entirely.
Cognitive Limitations
EMDR requires enough working memory and self-awareness to hold a target in mind, notice associations, and report on internal experience. Severe cognitive impairment, advanced dementia, or significant intellectual disability may make standard EMDR ineffective, though adapted protocols exist for some populations.
Inadequate Therapist Training
This is the contraindication most clients overlook. EMDR is a structured, eight-phase protocol that requires specific training. Weekend workshops without supervised practice are not enough. A therapist who skips the preparation and stabilization phases, or who is not trained to manage abreactions, can do real harm. Always ask about credentials, training, and consultation. Our guide on questions to ask an EMDR therapist covers this in detail.
How to Prepare and Reduce Your Risk of Serious Side Effects
The single most important predictor of safe, effective EMDR is the quality of preparation before reprocessing begins. The eight-phase protocol exists precisely to build that foundation, and shortcuts are where things go wrong.
Choose a Properly Trained Clinician
Look for a therapist who has completed an EMDRIA-approved basic training, which includes at least 50 hours of training plus 10 hours of consultation. Ideally, your therapist is an EMDRIA Certified Therapist or working toward certification. Ask directly: "Did you complete EMDRIA-approved training? How many hours of consultation have you had? Do you participate in ongoing consultation?"
Insist on a Thorough History and Treatment Planning Phase
A competent EMDR therapist will spend one to several sessions taking your history, screening for dissociation (often using the DES-II), evaluating contraindications, and identifying targets. If your therapist proposes reprocessing in the first session without this work, that is a red flag.
Build Stabilization Skills Before Reprocessing
The preparation phase teaches you tools to use when activation gets high — calm-place imagery, container exercises, grounding techniques, and bilateral stimulation for emotional regulation. You should leave preparation feeling more confident in your ability to self-soothe, not less. Do not let a clinician skip this step.
Pace the Work
A good EMDR therapist titrates the intensity of reprocessing, takes breaks when needed, and ends each session with a closure procedure that helps you leave activated material in a contained form. If you are leaving sessions feeling more destabilized than when you arrived and that pattern is not improving, raise it.
Use Coping Strategies Between Sessions
Plan light, predictable schedules around session days. Sleep, hydration, gentle movement, and time with safe people support nervous-system recovery. Avoid alcohol and recreational drugs in the days after a session, since they interfere with consolidation and processing. Keep a brief journal of what comes up between sessions so you can report patterns to your therapist.
Communicate Honestly
The most common error clients make is underreporting distress to spare the therapist or "look like a good patient." Your therapist needs accurate information to adjust the pace, change targets, or add support. Tell them when something is harder than expected.
EMDR Compared to Other Trauma Therapies
One useful way to think about EMDR's risk profile is to compare it to other evidence-based trauma therapies. None of them are risk-free, and all of them involve some degree of temporary symptom activation as part of treatment.
| Therapy | Common side effects | Typical activation level | Contraindications |
|---|---|---|---|
| EMDR | Vivid dreams, emotional volatility, fatigue, brief flashbacks | Moderate, time-limited | Active psychosis, severe dissociation, acute crisis |
| Trauma-focused CBT | Increased distress around homework, emotional difficulty between sessions | Moderate, distributed across week | Active psychosis, severe instability |
| Prolonged Exposure | High in-session distress, temporary symptom spike, dropout risk | High, often the highest of the three | Active psychosis, severe dissociation, acute suicidality |
| Somatic therapy | Strong body sensations, emotional release, temporary fatigue | Mild to moderate, slower pace | Few absolute contraindications, but slower benefit timeline |
Compared to prolonged exposure, EMDR tends to feel less overwhelming in-session because reprocessing happens in short sets rather than extended exposure. Compared to trauma-focused CBT, EMDR can move faster for single-incident trauma but often requires longer preparation for complex trauma. Compared to somatic approaches, EMDR is more structured and time-limited but may activate distress more sharply in any given session.
The right choice depends on your history, your current stability, your tolerance for in-session activation, and the availability of trained clinicians.
When to Contact Your Therapist or Seek Emergency Care
A useful rule of thumb is the "phone, plan, ER" framework. Use it to decide how to escalate when side effects feel harder than expected.
- Contact your therapist (within 24 hours) for symptoms that persist past 72 hours, sleep disruption beyond one night, intensifying distress between sessions, new dissociative episodes, or a sense that you are not coping with the pace of treatment. Most therapists welcome these calls and would rather adjust the plan than have you suffer or drop out.
- Activate your safety plan and contact your therapist immediately for new or worsening suicidal thoughts without intent or plan, self-harm urges, substance-use relapse, or symptoms that prevent you from functioning safely at work, with children, or while driving.
- Go to an emergency room or call 988 for active suicidal intent with a plan, self-harm in progress, severe and sustained dissociation that compromises safety, or any situation where you do not feel safe waiting until you reach your therapist. The 988 Suicide and Crisis Lifeline is available 24 hours a day in the United States.
Reporting a difficult reaction does not mean EMDR will be discontinued. It almost always means the work will be adjusted — slower pacing, more preparation, different targets, or additional resources — until you are stable enough to continue. The therapy is designed to be adjusted, not abandoned, when distress runs high.
For practical decision-making after weighing risk, see our breakdown of EMDR therapy cost and our overview of how EMDR fits into broader treatment for trauma and PTSD.
Frequently Asked Questions
Permanent harm from EMDR is rare when treatment is delivered by a properly trained clinician using the standard eight-phase protocol. The most cited risk is retraumatization, which occurs when reprocessing is attempted before adequate stabilization or with an untrained therapist who cannot manage abreactions. In well-structured treatment, distress during a session is real but contained, and the goal is to leave the memory in a less distressing form. Studies tracking EMDR patients over months and years find sustained improvement rather than worsening, suggesting the technique itself does not cause lasting damage when delivered properly. The variable that matters most is the clinician's training and your readiness, not the EMDR procedure itself.
Most common side effects — vivid dreams, emotional volatility, fatigue, mild headaches — resolve within 24 to 72 hours after a reprocessing session. Some clients notice continued processing during sleep for up to a week. Side effects also tend to lessen across the course of treatment as your nervous system adapts to processing without flooding. If a particular side effect lasts longer than 72 hours, intensifies rather than fades, or starts to interfere with daily functioning, contact your therapist so the pace or approach can be adjusted.
First, use the stabilization tools your therapist taught you during the preparation phase — calm-place imagery, grounding techniques, breathing exercises, or the container exercise. These are designed for exactly this situation. Second, contact your therapist by phone or message rather than waiting for the next scheduled session. Most EMDR therapists expect and welcome between-session contact when distress is high. Third, give yourself permission to slow down. You can request a break from reprocessing, a return to preparation work, or a different target. EMDR is meant to be adjusted to your nervous system, not the other way around. If you have active suicidal thoughts, self-harm urges, or feel unsafe, treat it as a crisis: activate your safety plan, call your therapist's emergency line, call 988, or go to an emergency room.
The Bottom Line
EMDR is one of the most studied and recommended treatments for trauma and PTSD, with a strong safety record when delivered properly. The dangers people fear — retraumatization, lasting harm, dissociation — are real possibilities in poorly trained hands or for clients who needed more preparation than they received, but they are not inherent to the technique. The eight-phase protocol exists precisely to prevent them.
The most important decisions you can make are choosing a properly trained EMDRIA-trained clinician, insisting on a thorough preparation phase, being honest about your history and current stability, and treating between-session distress as information rather than failure. With those foundations in place, EMDR's risks are manageable and its potential benefits significant.
If you are weighing whether EMDR is right for you, talk with a qualified EMDR therapist about your specific history, current life circumstances, and any conditions that might call for an adapted approach. The goal is not to avoid all discomfort. It is to make sure the discomfort you experience is productive, contained, and pointing toward lasting relief.