If someone passes out near you, the most important things to do are lower them safely to the ground, lay them on their back, and raise their legs about 12 inches to help blood flow back toward the brain. Most fainting episodes last less than a minute, and the person will typically wake up on their own once blood flow is restored. Here’s what to do in those critical moments and how to tell when the situation is more serious.
Step-by-Step First Aid for Fainting
If you see someone start to collapse, try to catch them or guide them to the ground to prevent a head injury. Once they’re down, lay them on their back and elevate their legs roughly 12 inches by propping them on a bag, a folded jacket, or your own knee. This helps gravity push pooled blood from the legs back toward the heart and brain. Loosen any tight clothing around the neck, chest, or waist, and check that they’re breathing normally.
If the person doesn’t regain consciousness within one minute, call 911. While waiting, turn them onto their side (the recovery position) so that if they vomit, they won’t choke. Keep monitoring their breathing. If they stop breathing and you can’t detect a pulse, begin CPR.
Once the person wakes up, don’t rush them to their feet. Sitting them up too quickly is one of the most common mistakes, and it can cause them to faint again. Let them stay lying down or sitting for several minutes. Offer water if they’re alert enough to drink safely.
What Not to Do
Don’t slap the person, throw water on their face, or try to force them to drink while they’re still unconscious. Don’t prop them up in a chair or hold them upright. The whole problem is that blood isn’t reaching the brain, and keeping someone vertical works against you. Don’t put anything in their mouth. If you suspect a seizure, the same rule applies: nothing goes in the mouth.
Why People Faint
Fainting (called syncope in medical terms) happens when blood flow to the brain drops suddenly. The most common type is vasovagal syncope, where the nervous system overreacts to a trigger. Your heart rate slows, the blood vessels in the legs widen, and blood pools in the lower body. The resulting drop in blood pressure starves the brain of oxygen for a few seconds, and you lose consciousness.
Common triggers include standing for long periods, intense heat, dehydration, the sight of blood, sudden pain, or strong emotional stress. Standing up too fast (orthostatic syncope) is another frequent cause, especially in older adults or people on blood pressure medication. Less commonly, fainting can signal a heart rhythm problem, which is why repeated or unexplained episodes deserve medical attention.
Fainting vs. Seizure: How to Tell
A simple faint and a seizure can look similar to a bystander, but a few key differences help you tell them apart. Fainting episodes typically last less than one minute. The person may have brief jerking movements, but they’ll go limp fairly quickly and come around fast once they’re lying down. Before the faint, they often report tunnel vision, nausea, cold sweats, dizziness, or looking pale.
Seizures last longer than one minute and involve more dramatic physical signs: sustained convulsions or rhythmic jerking, tongue biting, loss of bladder or bowel control, lip smacking, drooling, or random eye movements. After a seizure, the person is often confused and groggy for an extended period, whereas someone who fainted usually becomes alert within seconds of waking up. If you see any seizure signs, call 911, protect their head from hitting the floor, and do not restrain them.
When to Call 911
Not every fainting episode requires an ambulance, but certain signs mean you should call immediately:
- The person doesn’t wake up within one minute.
- They hit their head during the fall or are visibly injured.
- They have chest pain, shortness of breath, or an irregular heartbeat before or after passing out.
- They’re having convulsions or seizure-like movements.
- They fainted during exercise, which can point to a cardiac issue.
- They’re pregnant and fell on their abdomen, have vaginal bleeding, abdominal pain, or changes in the baby’s movement.
- They’re diabetic and you suspect a blood sugar problem.
If this is someone’s first time fainting, they should see a doctor even if they recover quickly. Repeat episodes also warrant a medical evaluation to rule out heart conditions or other underlying causes.
Helping a Pregnant Person Who Faints
Pregnancy increases fainting risk for several reasons. Hormonal shifts cause blood pressure to drop, blood volume changes can lead to low iron levels, and in the second and third trimesters, lying on the back puts pressure on a major vein that returns blood to the heart. Low blood sugar from skipped meals and overheating also contribute.
If a pregnant person faints, do not lay them on their back. Instead, gently roll them onto their left side with their left knee pulled up toward their chest. This takes pressure off that major blood vessel and restores circulation more effectively. If they don’t wake within one minute, or if they have a seizure or sustained jerking movements, call 911 immediately. Once they’re awake, they should contact their maternity provider, especially if they fell on their abdomen, notice any change in fetal movement, or have a history of high blood pressure or pre-eclampsia.
After They Wake Up
Recovery from a simple faint is usually quick, but the person shouldn’t jump back into their day. Have them sit or lie down for at least 10 to 15 minutes. Offer water or a light snack, particularly if they haven’t eaten recently or have been in the heat. When they’re ready to stand, help them up slowly and stay nearby in case they feel lightheaded again.
In the hours and days afterward, encourage them to stay well hydrated and avoid long periods of standing. If the fainting was triggered by heat, they should move to a cooler environment and rest. Driving should wait until they feel fully recovered and, if the episode was unexplained, until a doctor clears them. Kaiser Permanente recommends that people with recurrent fainting ask their doctor specifically about when it’s safe to drive, since sudden loss of consciousness behind the wheel is obviously dangerous.
For people who feel a faint coming on in the future, lying down and raising the legs preemptively can often prevent full loss of consciousness. Tensing the leg muscles, crossing the legs, or squatting down are other techniques that help push blood back toward the brain before the lights go out.