What to Do After Witnessing a Traumatic Event
Witnessing something frightening can leave you shocked, anxious, numb, or unable to stop replaying what happened. Here’s what to do next, and how to know when more support may help.
By Jenny Staats, LMSW · EMDR and trauma therapist at High Thrive Counseling · First published July 2023 · Last reviewed October 2026
First, get safe. Then keep things boring: stay near people you trust, eat, sleep when you can, and give your brain a break from replaying it. Strong reactions are common and often ease. If they’re intense, getting worse, or getting in the way of daily life, it’s a good time to talk with a therapist or medical professional.
You just saw something terrible happen
Maybe it was a car accident, a medical emergency, violence, a serious injury or a death. Something happened in front of you that your brain was not prepared to see.
And now you may be wondering what you’re supposed to do with that. You may feel shaky, numb, or unable to stop thinking about it. You may keep replaying one specific image. You may feel completely fine, then suddenly very much not fine three hours later.
All of that can happen after witnessing a traumatic event.
Your first job is not to process the entire experience. Your first job is to help your system realize: the event happened, you are here now, and the question is what you need next.
If the experience still feels very present after the immediate crisis has passed, and focused trauma treatment later makes sense, you can also learn about our EMDR intensives in Indianapolis, which offer longer blocks of time for focused trauma work.
First: make sure you are actually safe
This sounds obvious, but when people are in shock, obvious things can become strangely difficult. If the event has just happened, deal with immediate safety first.
- Move away from danger.
- Call 911 or emergency services when appropriate.
- Seek medical attention if needed.
- Contact someone you trust.
- Get somewhere physically safe.
- Let somebody else drive if you are too shaken to do so safely.
Deal with the actual emergency first. We can deal with your nervous system afterward.
What is normal after witnessing something traumatic?
Quite a lot, actually. People respond very differently, and your system noticed what you saw.
Feelings
Frightened, anxious, angry, helpless or guilty.
In the body
Shaky or physically activated, jumpy or unusually alert, exhausted but unable to sleep.
In the mind
Trouble concentrating, stuck replaying what happened, dreams about the event.
Distance
Feeling numb or detached, or avoiding the place where it happened.
“Why am I reacting like this?” Because you just witnessed something awful. Your system noticed. That does not automatically mean you have PTSD.
What should I do in the first few days?
This is where people sometimes feel pressure to do trauma recovery correctly. Please don’t turn it into another performance goal. You do not need to journal for three hours, meditate perfectly and emerge transformed by Thursday. Think boring. Boring is underrated after trauma.
Stay connected to safe people
You don’t have to tell twenty people the whole story, but try not to disappear completely. Call your spouse, text your sister, or sit with someone you trust. You might say: “I saw something really upsetting today. I don’t need you to fix it. I just don’t want to be alone with it.”
Take care of the basics
Your body just went through a significant stress response. Eat, drink water, sleep when you can, move your body, take your usual medications and keep some of your normal routine. Be cautious about using alcohol or drugs to manage what you feel.
Give your brain some space
You don’t need to keep exposing yourself to graphic footage, photos, social media posts or news coverage of what you saw. Looking once, then again, then reading the comments rarely helps your nervous system settle.
You do not need to tell the story over and over. If you want to talk with someone safe, or telling the story helps you feel less alone, talk. But you don’t have to force a detailed, emotional play-by-play before you’re ready. Talk when you are ready.
Why can’t I stop thinking about what happened?
Because your brain is trying to make sense of something unexpected and threatening.
One particular image may keep returning. Or a sound, a smell, a moment. Or a thought such as “What if I had done something differently?”, “That could have been me,” or “I can’t believe I saw that.”
Thinking about it repeatedly in the immediate aftermath doesn’t automatically mean something is wrong. Your brain may still be organizing what happened and updating its sense of safety.
An explanation of why trauma can affect memory, concentration, emotions and your sense of safety. It doesn’t mean every trauma reaction is PTSD. The video loads only when you press play.
When should I be more concerned?
I pay more attention when symptoms are very intense, not improving, getting worse, or beginning to interfere with everyday life. For example:
- You can’t sleep, or you have repeated nightmares.
- You are having flashbacks.
- You avoid driving, work or places that remind you of what happened.
- You feel constantly on guard or can’t concentrate.
- You feel emotionally numb or disconnected, or you are isolating.
- You are relying heavily on alcohol or substances.
- It is interfering with your relationships or ability to function.
Those are good reasons to talk with a therapist or medical professional.
What is acute stress disorder?
This is another term you may meet when you start Googling. Acute stress disorder (ASD) describes a cluster of significant trauma-related symptoms, such as intrusive memories, negative mood, feeling detached or unreal, avoiding reminders, sleep problems and feeling constantly alert or easily startled, that begin after a traumatic event and last from three days to a month. Symptoms lasting longer than a month are where a PTSD diagnosis comes into view.
Having some of those symptoms does not automatically mean you have ASD. A clinician looks at the combination, severity, timing and how much the symptoms are interfering with your life. When significant distress persists, it’s reasonable to get evaluated rather than diagnosing yourself from the internet.
Where does EMDR fit after a recent traumatic event?
Not “you witnessed something horrible yesterday, so everyone immediately needs EMDR.” Humans are more complicated than that, and many people recover naturally.
But if you have significant post-traumatic symptoms, or the event keeps feeling very present even though it’s over, EMDR may be one treatment option worth discussing with a trauma therapist. EMDR stands for Eye Movement Desensitization and Reprocessing. Rather than simply telling the story repeatedly, it helps the brain work with the memories, images, beliefs, emotions and body sensations that still feel stuck or disturbing.
Adapted for recent events
EMDR early intervention refers to approaches adapted for recent traumatic experiences. A recent memory may not feel like one tidy story. You might have:
- A visual image
- A sound
- A sensation in your body
- A particular moment
- A fear
- A belief such as “I’m not safe”
Not erasing the event
You already know it happened. The goal is for the memory to feel more like “something terrible happened” and less like “something terrible is happening again every time my brain remembers it.” That is an important difference.
Does early EMDR prevent PTSD?
I’d phrase this carefully. A 2024 systematic review of 11 randomized trials found short-term benefits of early EMDR interventions for post-traumatic symptoms after treatment and at three-month follow-up. The included studies were small and low quality, and the authors say more safety data are needed.
Early EMDR may be useful for some people with significant symptoms after a recent trauma. It’s not something every witness needs, and it isn’t a guarantee that PTSD will be prevented.
How soon after trauma should I see a therapist?
There’s no single correct answer. If you witnessed something disturbing yesterday and you’re shaken but functioning, sleeping reasonably well, staying connected and noticing your reactions gradually settling, you may not need to rush into trauma therapy. Give your system some time.
But you also don’t have to suffer for months before you’re “allowed” to ask for help. If symptoms are severe, you feel unsafe, you can’t function, the event involved significant loss or violence, or you simply feel you need professional support, reaching out sooner is reasonable.
You don’t need to know whether you have PTSD before reaching out. At High Thrive Counseling in Indianapolis, we work with people who experienced trauma directly and people who witnessed it and are surprised by how much it affected them. A free consultation can help you sort out what is happening, whether therapy is right for you now, and what format may fit, including an EMDR intensive when that makes clinical sense.
Schedule a free 15-minute consultation with JennyFrequently asked questions about witnessing a traumatic event
Can witnessing a traumatic event cause PTSD?
Yes. You don't have to be injured yourself: diagnostic criteria for PTSD include witnessing a serious event in person as it happens to someone else. But witnessing trauma doesn't mean you're destined to develop PTSD. Many people have strong stress reactions at first and gradually recover over time.
Is it normal to keep replaying what I saw?
Yes, especially in the first days. Your brain is trying to make sense of something unexpected and threatening, and one image, sound or moment may keep returning. It becomes more worrying when replaying is very intense, getting worse, or getting in the way of daily life.
Do I have to talk about it right away?
No. If talking with someone safe helps you feel less alone, talk. But you don't need to force a detailed, emotional play-by-play before you're ready because you think that's how trauma gets processed.
What should I do in the first few days?
Keep it boring: stay connected to safe people, eat, drink water, sleep when you can, move your body, take your usual medications, and give your brain a break from graphic footage, photos and news about what you saw. Be cautious about using alcohol or drugs to manage how you feel.
What is acute stress disorder?
Acute stress disorder (ASD) describes a cluster of significant trauma-related symptoms that begin after a traumatic event and last from three days to a month. Having some of these symptoms doesn't automatically mean you have ASD. A clinician looks at the combination, severity, timing and how much the symptoms interfere with your life.
Does early EMDR prevent PTSD?
Research on EMDR soon after a traumatic event is promising but early. A 2024 review of 11 randomized trials found short-term benefits for post-traumatic symptoms, but the studies were small and of low quality, and the authors call for more safety data. EMDR isn't something every witness needs, and it isn't a guarantee that PTSD will be prevented.
How soon after trauma should I see a therapist?
There's no single answer. If you're shaken but functioning, sleeping reasonably well, staying connected and noticing your reactions settling, you may not need to rush. But you don't have to suffer for months before asking for help. If symptoms are severe, you feel unsafe, you can't function, or the event involved significant loss or violence, reaching out sooner is reasonable.
Are EMDR intensives an option after a recent traumatic event?
They can be, once the immediate crisis has passed and a specific memory or experience still feels very present. An EMDR intensive is a longer block of protected time for focused trauma work. A free consultation can help decide whether weekly therapy, an intensive or neither makes sense right now.
Meet Jenny Staats, LMSW
Warm. Practical. Collaborative. Less “try harder.” More “let’s figure out why this isn’t working.”
Jenny provides EMDR therapy and EMDR intensives at High Thrive Counseling in Indianapolis. Her approach is paced around the person in front of her, not around how much trauma is supposedly meant to fit into a single session.
Jenny also works with teens, young adults, adults, and couples navigating ADHD, anxiety, depression, trauma, overwhelm, relationship stress, premarital concerns, perimenopause, and major life transitions.
- EMDR + Trauma
- EMDR Intensives
- ADHD
- Anxiety + Depression
- Teens + Young Adults
- Couples + Premarital
In person in Broad Ripple, Indianapolis · Online in Indiana · Online therapy in Florida
Sources
- Torres-Giménez, A., Garcia-Gibert, C., Gelabert, E., et al. (2024). Efficacy of EMDR for early intervention after a traumatic event: A systematic review and meta-analysis. Journal of Psychiatric Research, 174, 73–83. Read the record
- American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR): criteria for acute stress disorder and posttraumatic stress disorder, including witnessing an event in person.
This article is general education. It doesn’t replace an individual assessment or treatment. If you are in an emergency or may harm yourself, call 911, or call or text 988.