When someone collapses in front of you, the first thing to do is check whether they’re responsive and breathing. Everything that follows depends on the answer. A collapse can look dramatic and feel paralyzing, but the steps you need to take are straightforward, and acting quickly can be the difference between life and death, especially in cardiac arrest where every minute without intervention reduces survival chances.
Check for Danger, Then Check the Person
Before you touch anyone, take a quick look around. Make sure there’s no immediate hazard to you: traffic, fire, electrical wires, or an unstable structure. You can’t help if you become a second victim.
Once the scene is safe, try to get a response. Tap the person firmly on the shoulders, shout their name or “Are you okay?” If there’s no response, look at their chest for 5 to 10 seconds. Is it rising and falling? Are they gasping, making choking sounds, or completely silent? Normal breathing means the heart is still working. No breathing, or only occasional gasps, suggests cardiac arrest.
Call Emergency Services Immediately
If the person isn’t responding, call 911 right away, or have someone nearby do it while you stay with the person. Put the phone on speaker so you can talk and act at the same time. The dispatcher will ask for your location (including a street address, floor, or apartment number if you’re in a large building), the phone number you’re calling from, and what’s happening. Describe what you see: “A man collapsed, he’s not breathing,” or “A woman fainted and she’s coming around.” These details help dispatchers send the right resources faster.
Stay on the line. Dispatchers are trained to walk you through exactly what to do next, including CPR if needed. Follow their instructions even if you’ve never had training.
If They’re Not Breathing: Start CPR
When someone collapses and isn’t breathing normally, their heart has likely stopped. This is cardiac arrest, and CPR keeps blood flowing to the brain until paramedics arrive. Brain damage can begin within four to six minutes without blood flow.
If you’re untrained or unsure, the American Heart Association recommends hands-only CPR for bystanders who witness an adult collapse. Place the heel of one hand in the center of the chest, put your other hand on top, and push hard and fast. Aim for a depth of about two inches and a rate of 100 to 120 compressions per minute (roughly the tempo of the song “Stayin’ Alive”). Don’t stop until paramedics take over or the person starts breathing on their own.
If you’ve been trained in CPR with rescue breaths, the ratio is 30 compressions to 2 breaths. Tilt the head back, lift the chin, pinch the nose, and give two breaths after every 30 compressions. But compressions are the priority. Pushing hard and continuously matters more than perfect technique.
Use an AED if One Is Available
Automated external defibrillators are mounted on walls in many airports, gyms, offices, and public buildings. If someone nearby can grab one while you do CPR, use it. Turn it on and follow the voice prompts. The device analyzes the heart rhythm and delivers a shock only if needed. You cannot accidentally shock someone who doesn’t need it.
Survival rates when a bystander uses an AED before paramedics arrive are dramatically higher, with studies showing the gap between bystander defibrillation and waiting for emergency medical services ranges from 5% to 42% in survival depending on the setting and response time. Every minute counts.
If They’re Breathing but Unconscious
When someone has collapsed and is unresponsive but breathing normally, they need to be placed in the recovery position. This keeps their airway open and prevents them from choking if they vomit.
Start with the person flat on their back. Move the arm closest to you out to the side, bent at the elbow in an L-shape so the hand is about level with their head. Take their far hand and bring it across their body, holding the back of that hand against the cheek nearest to you. With your other hand, bend their far knee up. Gently roll them toward you by pulling on that bent knee. Adjust their top leg so both the hip and knee are at right angles. Tilt the head slightly back to keep the airway open, with the face angled downward. While holding them, keep the back of your hand near their mouth so you can feel their breath continuing.
Stay with them and monitor their breathing until help arrives.
If You Suspect a Seizure
A seizure-related collapse typically involves sudden stiffening followed by rhythmic jerking of the limbs. It can look alarming, but most seizures resolve on their own within one to three minutes. Your job is to protect the person, not stop the seizure.
Help them to the ground if they aren’t already there. Clear away furniture, sharp objects, or anything they could hit. Do not hold them down or try to restrain their movements. Do not put anything in their mouth. It is physically impossible to swallow your tongue, and forcing objects between the teeth can cause broken teeth or jaw injuries. Time the seizure from the moment it starts. If it lasts longer than five minutes, call 911 immediately, as this is a medical emergency. Once the jerking stops, roll them onto their side and speak calmly. Confusion and drowsiness after a seizure are normal and can last several minutes.
If You Suspect Low Blood Sugar
People with diabetes can collapse when their blood sugar drops dangerously low. Warning signs before a collapse often include shakiness, sweating, confusion, and slurred speech. If the person is still conscious enough to swallow safely, give them something sugary: about 7 ounces of orange juice, a handful of jellybeans, glucose tablets, or regular (not diet) soda. Diet drinks use artificial sweeteners and won’t raise blood sugar. You’re aiming for roughly 20 grams of sugar.
If the person is unconscious, do not try to put food or liquid in their mouth, as they could choke. Some people with diabetes carry a glucagon kit, which is an emergency medication that raises blood sugar rapidly. If someone nearby knows how to use it, have them administer it. Otherwise, call 911 and place the person in the recovery position while you wait.
If you aren’t sure whether the person’s blood sugar is too low or too high, giving sugar is still the right call. A small amount of sugar is lifesaving if levels are dangerously low and won’t cause significant harm if levels are high.
If You Suspect an Opioid Overdose
Signs of an opioid overdose include extremely slow or absent breathing, blue or grayish lips and fingertips, pinpoint pupils, and unresponsiveness. Try to rouse the person by shaking them, calling their name, or rubbing your knuckles firmly on the center of their chest. If they don’t respond, call 911 and mention that the person is unresponsive.
If you have naloxone (commonly known by the brand name Narcan), administer it. The nasal spray version requires no training: place the nozzle in one nostril and press the plunger. If the person doesn’t respond within two to five minutes, give a second dose. After giving naloxone, tilt the head back, check that nothing is blocking the mouth, and give two slow rescue breaths. Stay with the person until paramedics arrive, because naloxone wears off faster than many opioids, and the person can stop breathing again.
Simple Fainting vs. Cardiac Arrest
Not every collapse is a cardiac emergency. Simple fainting, called vasovagal syncope, happens when blood pressure drops suddenly and the brain briefly loses blood flow. The person may feel dizzy or lightheaded beforehand, and they typically regain consciousness within seconds to a minute. Fainting tends to happen while standing still, in hot environments, or after emotional stress.
Cardiac-related collapses look different. They’re more likely to occur during or right after physical activity, with research showing that 65% of cardiac-related fainting episodes happen around exertion, compared to only 18% of simple faints. A person in cardiac arrest won’t wake up on their own, won’t be breathing normally, and may look pale or blue. When in doubt, treat it as serious. Call 911, and if the person isn’t breathing, start CPR.
Legal Protections for Bystanders
Many people hesitate to help because they worry about being sued if something goes wrong. Good Samaritan laws exist in all 50 U.S. states and protect people who provide emergency care in good faith without expecting payment. These laws shield you from claims of ordinary negligence, meaning you won’t be held liable for making an honest mistake while trying to help. They do not cover reckless or intentionally harmful actions, but if you’re genuinely trying to save someone’s life, you’re protected. A cracked rib during CPR, for example, is a known and accepted consequence of chest compressions, not something you’d be liable for.