When someone passes out, lay them flat on their back and raise their legs about 12 inches off the ground. Most fainting episodes resolve within a minute, but if the person doesn’t wake up within that time or stops breathing, call 911 immediately. Those first few seconds matter: your job is to protect them from injury, keep their airway clear, and help blood flow back to their brain.
Step by Step: What to Do Right Away
If you see someone starting to faint, try to catch them or guide them to the ground to prevent a head injury. About 30% of people who faint and end up in an emergency room have a physical injury from the fall itself, and roughly 5% of those injuries are severe. Once they’re down, here’s what to do:
- Lay them flat on their back. This is the single most important step. Elevating the legs about 12 inches helps blood return to the heart and brain. In clinical testing, leg elevation prevented fainting symptoms in nearly all subjects, while being upright caused half of participants to nearly faint within 27 minutes.
- Loosen tight clothing. Undo belts, ties, or anything constricting around the neck or chest.
- Check for breathing. Watch for chest movement, listen for breath sounds, and feel for air from the nose or mouth. If the person is not breathing, begin CPR and call 911.
- Start a mental timer. If they don’t regain consciousness within one minute, call 911.
- Don’t put anything in their mouth. No water, no food, no fingers. A person who is unconscious can choke.
If the person is breathing but you can’t stay right by their side to monitor them, or if they begin vomiting, roll them into the recovery position on their side. This keeps the airway open and lets fluid drain from the mouth rather than into the lungs.
How to Place Someone in the Recovery Position
With the person on their back, kneel beside them. Extend the arm closest to you straight out at a right angle, palm facing up. Take their other arm and fold it across their chest so the back of that hand rests against the cheek nearest you, then hold it there. With your free hand, bend their far knee up to a right angle. Now pull that bent knee toward you, rolling them gently onto their side. Their bent arm supports their head, and their extended arm prevents them from rolling face-down. Tilt the head back slightly to keep the airway open.
If you suspect a spinal injury, such as after a fall from height or a car accident, don’t move the person. Leave them where they are as long as they’re breathing.
What Not to Do
Resist the urge to splash water on the person’s face, shake them, or sit them upright. Sitting or propping someone up works against you because the whole problem is that not enough blood reached the brain. You want gravity on your side, not fighting against it.
Smelling salts are another common instinct. While they can trigger a sharp inhalation by irritating the nasal passages, they’re no longer recommended medically. The bigger risk is that the jolt of consciousness can mask a serious underlying injury. If someone fainted because of a heart rhythm problem or a head injury from the fall, waking them with ammonia doesn’t fix the cause and may delay proper evaluation.
Don’t give food or water until the person is fully awake, alert, and able to swallow safely. The one exception: if you know the fainting was caused by low blood sugar (for example, in someone with diabetes who skipped a meal), offer something sweet once they’re conscious and responsive.
When It’s an Emergency
Treat any loss of consciousness as a potential emergency until you know the cause. Call 911 if:
- The person doesn’t wake up within one minute
- They stop breathing or have no pulse
- They fell and hit their head
- They have chest pain, shortness of breath, or a rapid or irregular heartbeat
- They’re pregnant
- They have diabetes
- They’re over 50 and have never fainted before
- They fainted during exercise
Fainting during physical exertion is a red flag for heart-related causes and should always be evaluated, even if the person feels fine afterward.
Fainting vs. a Seizure
It’s not always obvious whether someone fainted or had a seizure, and the distinction changes what kind of help they need. A simple faint typically lasts less than a minute. The person may have brief jerking movements, but they’ll wake up fairly quickly and know where they are. A seizure lasts longer, often a full minute or more, and involves sustained convulsions or involuntary rhythmic movements. Afterward, the person is usually confused, disoriented, and may not remember what happened.
If you suspect a seizure, don’t restrain the person or put anything in their mouth. Move nearby objects out of the way, protect their head, and time the episode. A seizure lasting longer than five minutes is a medical emergency.
Why Fainting Happens
Fainting occurs when blood pressure drops suddenly and the brain doesn’t get enough blood flow. The most common type, called vasovagal syncope, accounts for the majority of fainting episodes in otherwise healthy people. It happens when the vagus nerve overreacts to a trigger, simultaneously slowing the heart rate and widening blood vessels. The combination causes a rapid drop in blood pressure, and the brain essentially loses power for a few seconds.
Common triggers include standing for a long time, heat exposure, dehydration, seeing blood, sudden pain, or intense emotional stress. Some people faint from situational triggers like coughing hard, straining on the toilet, or standing up too quickly after sitting or lying down. That last one, called orthostatic hypotension, is especially common in older adults and people on blood pressure medications.
Less commonly, fainting signals something more serious: a heart rhythm abnormality, a structural heart problem, or a blood sugar crash. This is why the cause matters. A single faint after standing in the sun all day is very different from repeated unexplained episodes or fainting during exercise.
After They Wake Up
Once the person regains consciousness, don’t let them jump right back up. Have them stay lying down or sitting for at least 10 to 15 minutes. Standing too quickly can trigger a second episode. Offer small sips of water if they’re fully alert. Ask if they know where they are and what happened, both to check their mental clarity and to help you gauge whether this was a simple faint or something else.
If the person feels dizzy or lightheaded when they try to sit up, have them lie back down and wait longer. Feeling drained, slightly nauseous, or sweaty afterward is normal. Feeling confused, having a headache from a fall, or experiencing chest discomfort is not, and warrants medical attention.
Preventing Fainting If You Feel It Coming
About 35% of people will faint at least once in their lifetime, and many get warning signs: tunnel vision, feeling warm, nausea, lightheadedness, or hearing sounds become distant. If you or someone near you reports these symptoms, the first priority is getting into a safe position, either sitting with the head between the knees or lying down.
Physical counterpressure maneuvers can also help. These involve tensing the muscles in your legs, arms, or abdomen to squeeze blood back toward the heart and raise blood pressure. Crossing your legs and squeezing them together, gripping one hand with the other and pulling outward, or clenching your fists repeatedly have all been shown to work. A review of 11 clinical trials found these techniques cut the risk of progressing to a full faint by roughly 50%.