June 23, 2026 · By Dan Zamfir, RP
Most shifts end and life carries on. But every first responder knows the calls that don't end when the truck backs into the bay, the ones that follow you home, replay at 3 a.m., and sit with you for days. That lingering reaction has a name: critical incident stress. Understanding it is the first step to making sure it doesn't quietly take a toll.
A critical incident is any event with enough emotional force to overwhelm the usual ways a person copes. For frontline workers that might be a line-of-duty death, a call involving a child, a violent scene, a mass-casualty event, or an incident that hits close to home. It isn't about being weak or unprepared. By definition, these are events that would affect almost anyone.
In the moment, training takes over. You do the job. The stress response often arrives later, once the adrenaline drains and the body finally registers what it just moved through. Common reactions in the hours and days after include:
For most people, these reactions ease over a couple of weeks. They are a normal response to an abnormal event. The concern is when they don't settle, when they start interfering with work and home, or when they get buried instead of processed.
The instinct in emergency services is to pack it away and get to the next call. Over a career, though, those packed-away incidents accumulate. Cumulative exposure is one of the reasons first responders carry mental-health symptoms at far higher rates than the general public. Processing a hard call early isn't the soft option. It's the durable one.
This is exactly the gap a well-built peer support program is designed to fill. A trained peer, someone who has stood in the same boots, can check in after a tough call, normalize what a member is feeling, and help them decide whether they want more support. Peer support reaches people early and informally, in a way that clinical services often can't.
It works best when it's structured and clinically supervised, so peers know their scope and have a clear path to professional help when a situation calls for it. That structure is the work OSRC does with fire, police, and paramedic organizations, building peer teams that are trained, supported, and not carrying it alone.
If a recent call is still sitting with you, that doesn't mean something is wrong with you. It means you're human and the call mattered. Talking it through early is one of the most effective things you can do.
Consider professional support if the reactions last more than a few weeks, get worse, disrupt your sleep or relationships, or pull you toward drinking or isolating to cope. Therapy gives you a confidential space to process what happened so it doesn't keep running in the background. See therapy for first responders for how that work looks.
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This article is general information, not a substitute for professional care. If you or a colleague is in crisis, call or text 988 (Suicide Crisis Helpline) anytime.