When You Pass Out Are You Still Breathing?

When you pass out, you are still breathing. Fainting, also called syncope, is a temporary loss of consciousness caused by a sudden drop in blood flow to the brain. Your breathing continues because the brain stem, which controls breathing, is not the part of the brain that shuts down during a simple faint. The person usually wakes up within a minute or two once blood flow returns to the brain.

What Happens to Your Body When You Faint?

Fainting is not the same as going into cardiac arrest. During a faint, the heart keeps beating. The problem is that blood pressure drops suddenly, and less blood reaches the brain. When the brain does not get enough oxygen, it briefly stops doing its higher functions. That is why you lose consciousness.

Breathing is different. It is controlled by the brain stem, a more primitive part of the brain. The brain stem keeps working during a simple faint. So the person continues to breathe on their own. The breaths may be shallow or irregular for a short time, but they do not stop.

This is an important difference between fainting and cardiac arrest. In cardiac arrest, the heart stops beating and the person stops breathing. In fainting, the heart keeps pumping and breathing continues.

How Can You Tell If Someone Is Fainting or in Cardiac Arrest?

It can be hard to tell in the moment. But there are some clear differences.

If someone is fainting, they usually wake up within a minute or two. Their color returns quickly. They may feel confused for a few seconds but then recover. They continue breathing the whole time.

If someone is in cardiac arrest, they do not wake up. They do not breathe normally. They may make gasping sounds, but that is not real breathing. They need CPR immediately.

Here is the key test: check for normal breathing. Look at the chest. Listen for breath sounds. Feel for air on your cheek. If the person is breathing normally, it is likely a faint. If they are not breathing or only gasping, it is a medical emergency.

What Causes Someone to Pass Out?

The most common cause is called vasovagal syncope. This happens when your body overreacts to a trigger. The trigger can be pain, fear, the sight of blood, standing for too long, or sudden emotional stress. Your heart rate slows and your blood vessels widen. Blood pools in your legs. Blood pressure drops. The brain does not get enough blood, and you faint.

Other causes include:

• Dehydration or not eating enough
• Standing up too quickly (orthostatic hypotension)
• Low blood sugar
• Heart rhythm problems
• Medications that lower blood pressure

Most fainting episodes are harmless and happen once. But some are signs of a more serious heart condition. If fainting happens during exercise, happens more than once, or happens without any warning signs, it needs a medical evaluation.

Is It Dangerous If Someone Stops Breathing After Fainting?

Yes. If a person stops breathing after passing out, that is not a simple faint. That is a medical emergency. Call 911 immediately and start CPR if you are trained.

There is a condition called convulsive syncope that can look like a seizure. The person may jerk or twitch for a few seconds after fainting. This can be alarming, but it is different from a true seizure. In convulsive syncope, the person still breathes and recovers quickly. In a true seizure, breathing can be disrupted and recovery takes longer.

If you are ever unsure whether someone is breathing, treat it as an emergency. It is always better to call for help than to assume everything is fine.

What Should You Do When Someone Faints?

If someone faints, help them get to the floor safely. Do not try to hold them up. Once they are down, lay them flat on their back. Elevate their legs about 12 inches if possible. This helps blood flow back to the brain.

Check their breathing immediately. Look at the chest rising and falling. Listen for breath sounds. Do this for no more than 10 seconds. If they are breathing, loosen any tight clothing around their neck. Do not give them anything to eat or drink until they are fully awake.

Do not splash water on their face. Do not slap them. Do not make them sit up quickly. These old remedies do not help. The best thing is to keep them flat until they wake up naturally, which usually happens within a minute.

After they wake up, have them stay lying down for a few minutes. Then help them sit up slowly. If they feel dizzy again, lay them back down.

When Should You See a Doctor After Fainting?

Most people do not need to see a doctor after a single fainting episode. But some situations require medical attention.

See a doctor if you fainted during exercise or physical activity. Fainting while active can point to a heart rhythm problem. See a doctor if you fainted more than once. See a doctor if you felt chest pain, palpitations, or shortness of breath before fainting. See a doctor if you were injured when you fell.

Fainting in an older adult also needs evaluation. Older adults are more likely to have underlying heart conditions or medication-related causes. A single episode in an otherwise healthy young person is less concerning, but it is still worth mentioning to your doctor at your next visit.

If the person does not wake up within two minutes, call 911. If they are not breathing, call 911 and start CPR.

Can You Prevent Fainting?

If you know your triggers, you can sometimes avoid them. If you faint at the sight of blood, lie down or sit with your head between your knees when you know you will face that situation. If you faint from standing too long, keep moving your legs and shift your weight. This keeps blood from pooling.

Stay hydrated. Dehydration lowers blood volume, which makes fainting more likely. Eat regular meals. If you take blood pressure medication, talk to your doctor about whether it might be contributing.

When you stand up from sitting or lying down, do it slowly. Give your body a moment to adjust. This is especially important for older adults.

If you feel faint coming on, act fast. Sit down or lie down immediately. Crossing your legs and tensing your muscles can also help raise blood pressure. These techniques do not work for everyone, but they are worth trying if you feel lightheaded.

When You Pass Out Are You Still Breathing: The Bottom Line

Yes, you are still breathing when you pass out from a simple faint. The brain stem keeps controlling your breathing even while you are unconscious. The person wakes up quickly once blood flow returns to the brain.

The real question is whether the person is breathing normally. Normal breathing means fainting. No breathing or gasping means cardiac arrest. That distinction can save a life.