If someone near you passes out, the most important thing to do is lay them on their back and raise their legs about 12 inches off the ground. This helps blood flow back toward the brain, which is what caused them to lose consciousness in the first place. Most people recover within a minute. If they don’t wake up within that time, call 911 immediately.
What to Do in the First 60 Seconds
As soon as someone collapses, check that they’re breathing. If they are, lay them flat on their back on a firm surface and elevate their legs by propping them on a chair, bag, or your own knees. Loosen any tight clothing around the neck, chest, or waist. If they fell hard, avoid moving them unless they’re in danger, since they may have injured their head or spine.
If the person is not breathing, call 911 and begin CPR if you’re trained. An unconscious person who isn’t breathing is a cardiac emergency, not a simple faint.
Once the person wakes up, don’t let them stand right away. Sitting or getting up too fast can cause them to pass out again. Have them stay lying down or seated for at least 10 to 15 minutes. Offer water or a drink with electrolytes if available.
When to Call 911
A typical faint lasts less than a minute. If someone stays unconscious longer than that, it’s no longer a routine episode. Call emergency services if any of the following apply:
- They don’t wake up within a minute
- They hit their head or are bleeding from the fall
- They’re not breathing
- They lost bladder or bowel control
- They had convulsions or seizure-like movements
- They’re pregnant
- They have diabetes
- They’re over 50
Even after someone wakes up, call 911 if they report chest pain, a pounding or irregular heartbeat, trouble speaking, vision problems, or weakness in their arms or legs. These can signal a heart problem or stroke rather than a simple faint.
Fainting vs. Seizure: How to Tell
A faint and a seizure can look similar at first glance. Both involve collapsing and possible twitching. But there are clear differences. A faint typically lasts under a minute, and the person wakes up alert and aware of where they are. A seizure lasts longer, often involves violent shaking, random eye movements, lip smacking, or drooling, and the person is usually confused or disoriented afterward with no memory of what happened. Tongue biting and loss of bladder control point strongly toward a seizure.
Brief jerking movements can happen during a faint and don’t automatically mean it was a seizure. The key distinction is duration and the person’s mental state when they come to. If they seem confused for more than a few seconds after waking, treat it as a possible seizure and get medical help.
Why People Faint
Fainting happens when blood pressure drops suddenly and the brain doesn’t get enough blood flow. The two most common types work through opposite mechanisms.
In younger people, the most common cause is vasovagal syncope. This is triggered by an overreaction of the nervous system to things like pain, fear, standing too long, dehydration, or the sight of blood. The body initially ramps up its stress response, then the brain overcorrects by slowing the heart rate and dropping blood pressure all at once. This is why younger people often get warning signs beforehand: nausea, sweating, pale skin, tunnel vision, or feeling warm. About 64% of people under 30 who faint experience these warning signs, compared to only 26% of those over 60.
In older adults, fainting is more often caused by orthostatic hypotension, where the body simply fails to adjust blood pressure when changing positions. Standing up from a chair or getting out of bed causes blood to pool in the legs, and the cardiovascular system doesn’t compensate fast enough. This type accounts for about 23% of fainting episodes in people over 60, compared to just 3% in younger adults. Older adults are also more likely to have multiple contributing causes at once, making their episodes harder to diagnose and more likely to signal a serious underlying condition.
Caring for Someone After They Recover
Once someone is conscious and stable, the next few hours still matter. Have them drink plenty of fluids, ideally water or an electrolyte drink. If their blood sugar might be low (they skipped a meal, for instance), give them something to eat. Keep them seated or lying down until they feel completely normal, and stay with them in case they feel faint again.
The person should not drive afterward. Medical guidelines recommend avoiding driving for at least four weeks after a fainting episode if a cause has been identified and treated. If no cause is found, the recommendation extends to six months. This applies even if the person feels perfectly fine, because the risk of losing consciousness behind the wheel is real and the legal implications are serious.
What Doctors Look For Afterward
A single faint in a young, otherwise healthy person, especially one with a clear trigger like standing too long in the heat, often doesn’t need extensive medical workup. But fainting without an obvious cause, fainting that happens more than once, or fainting in someone over 50 warrants a medical evaluation.
The most common first test is an electrocardiogram (ECG), which checks the heart’s electrical activity. It only identifies the cause in about 5% of cases, but it can catch dangerous heart rhythm problems. Doctors will also check blood sugar and basic blood work, especially in older adults. If a heart condition is suspected, further monitoring with a portable heart monitor or an ultrasound of the heart may follow. For people with recurrent unexplained fainting, a tilt table test can help determine whether the nervous system is overreacting to position changes.
Preventing Future Episodes
If someone you’re with has a history of fainting, or if you’ve fainted before yourself, there are physical techniques that can stop an episode before it happens. These work by pushing blood back toward the heart and brain when you feel warning signs like lightheadedness or nausea.
The simplest option is to immediately sit or squat down. Crossing your legs while tensing your thigh and abdominal muscles is one of the most studied techniques and helps compress the veins in your lower body to push blood upward. Gripping one hand tightly with the other (a sustained hand grip) also raises blood pressure in the short term. Bending forward with your head between your knees shortens the distance blood has to travel to reach your brain. Any of these can buy enough time to prevent a full blackout.
Long term, staying well hydrated is the single most effective lifestyle change. Dehydration reduces blood volume, which is one of the primary factors that accelerates fainting in people who are prone to it. Eating regular meals to maintain blood sugar and avoiding prolonged standing, especially in warm environments, also help reduce the frequency of episodes.