An unconscious person can die from a blocked airway even when their heart is perfectly healthy. The airway is the passage air travels through on its way to the lungs, and when it closes off, oxygen stops reaching the brain within minutes. Knowing how to open and protect it is one of the most useful skills in first aid.
How the Airway Gets Blocked
In an unconscious person lying on their back, the muscles of the tongue relax along with everything else. Because the tongue is attached to the lower jaw, gravity lets it fall backward and block the throat. This is the single most common cause of airway obstruction in an unresponsive patient, far more common than choking on food or an object. Vomit, blood, loose dentures and swelling from injury or allergic reaction can also block the airway.
Opening the Airway with a Head Tilt and Chin Lift
Kneel beside the patient and place one hand on their forehead. With your other hand, place two fingers under the bony point of the chin and lift gently while tilting the head back. This movement pulls the tongue forward off the back of the throat. Avoid pressing on the soft tissue under the chin, since this can push the airway closed rather than open.
For infants under one year, use a much gentler tilt, keeping the head close to a neutral or horizontal position rather than tilting it fully back. Over tilting a baby’s head can itself close the airway because of how flexible their neck still is.
When You Suspect a Spinal Injury
If there is a reasonable chance of a neck or spinal injury, such as a fall from height or a high speed collision, you should still open the airway using a jaw thrust instead of a head tilt where you are trained to do so. Place your fingers behind the angles of the jaw on both sides and push it upward and forward without tilting the head back. Airway comes before spine every time. A person with a spinal injury who cannot breathe will not survive long enough for the spinal injury to matter.
Clearing Visible Obstructions
Once the airway is open, look inside the mouth. If you can see an object, blood, vomit or loose dentures clearly, remove them with your fingers. Do not perform a blind sweep with your finger if you cannot see anything, since this risks pushing an obstruction further down the throat instead of out.
Protecting the Airway with the Recovery Position
Once a patient is breathing normally but still unconscious, the airway remains at risk from the tongue and from vomit. Rolling the person onto their side into the recovery position uses gravity to keep the airway clear and allows fluid to drain from the mouth rather than pool in the throat. This single action prevents a large number of otherwise avoidable deaths in unconscious patients.
Signs the Airway Is Still Blocked
A completely blocked airway is often silent, since no air is moving to make noise. A partially blocked airway tends to be noisy, producing snoring, gurgling or a high pitched sound called stridor. Any of these noises in an unconscious patient means the airway needs immediate attention, not observation.
Frequently Asked Questions
What is the most common cause of airway blockage in an unconscious person?
The tongue falling backward against the throat due to relaxed muscles, not choking on an object.
Should you tilt an infant’s head back the same way as an adult’s?
No. Infants need a much gentler, more neutral head position. Over tilting can close a baby’s airway rather than open it.
What do you do if you suspect a spinal injury but the person is not breathing?
Open the airway anyway, using a jaw thrust if you are trained in it. An open airway always takes priority over spinal precautions.
References and Last Reviewed
- American Heart Association, Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care
- International Liaison Committee on Resuscitation (ILCOR), Consensus on Science and Treatment Recommendations
Jurisdiction: General first aid guidance, internationally applicable.
Last technically reviewed: September 2026
Reviewed by: EHS Guidelines Editorial Team
This article is educational and does not replace accredited first aid training or professional medical care. In a real emergency, call your local emergency number immediately.
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