Drowning kills through a single mechanism above everything else, the interruption of oxygen to the brain, and the speed of rescue and resuscitation is what decides whether someone survives it with no lasting harm. Understanding what actually happens in the body during drowning helps explain why the first aid response looks the way it does.
What Happens During Drowning
A conscious person entering water usually holds their breath instinctively, but eventually begins vigorous breathing efforts even if they lose consciousness in the process. This often causes water to enter the airway, triggering spasm of the voice box or forceful coughing, and water may enter the lungs. Many victims also swallow large amounts of water, which commonly causes vomiting.
In some cases the voice box spasm relaxes after the person loses consciousness, allowing water and vomit to be drawn into the lungs. In other cases the spasm does not relax, which can leave the lungs relatively dry even though the outcome for the brain is just as serious, since oxygen still is not getting through.
Immediate Management
- Remove the patient from the water as quickly as it is safely possible to do so.
- If they are unconscious, turn them onto their side into the recovery position.
- Clear the airway and follow the standard basic life support flow chart, beginning CPR immediately if they are not breathing normally.
- Seek urgent medical assistance, since even an apparently successful rescue carries real risk of delayed complications.
The Number One Rule for Rescuers
Do not attempt to rescue a drowning victim beyond your own swimming ability. This single rule prevents needless deaths every year, when a well meaning rescuer becomes a second victim and the original casualty is left with no one able to help either of them. Use a flotation aid, a rope, or call for trained water rescue rather than swimming out yourself if you are not a strong, confident swimmer in those conditions.
Watching for Vomiting
Because drowning victims have often swallowed large amounts of water, vomiting during the rescue and immediate aftermath is common. If the patient begins to vomit, roll them onto their side immediately to clear the airway rather than leaving them on their back.
Do Not Attempt to Empty a Distended Stomach
If the patient’s stomach appears distended from swallowed water, do not press on it to try to empty it. This increases the risk of triggering vomiting with the airway less protected, and does not meaningfully help their breathing.
Suspected Spinal Injury in the Water
If a conscious victim in the water reports neck pain or altered sensation in their fingers or toes, support their head and neck to maintain spinal alignment where possible while removing them from the water. In situations such as heavy surf or fast flowing water where this is not practical, prioritise getting them out of the water as quickly and gently as circumstances allow. If the victim is unconscious, turn them face upward and remove them from the water immediately without delay, since airway takes priority over spinal precautions, and devices such as cervical collars have no place in the immediate water rescue itself.
Why Medical Observation Afterward Is Essential
Every person who has experienced a near drowning, or who has been resuscitated after drowning, needs to be assessed by medical staff, ideally in hospital, even if they seem to recover fully at the scene. Delayed lung complications from inhaled water are common and can develop hours after the initial event, sometimes well after the person appears to be breathing normally again.
Frequently Asked Questions
What is the most important rule for someone trying to rescue a drowning person?
Never attempt a rescue beyond your own swimming ability. Use flotation aids, ropes or call for trained help instead of swimming out yourself if you are not confident you can manage it safely.
Why do drowning victims need to be seen by a doctor even after they seem to recover?
Delayed lung complications from inhaled water are common and can develop hours after the event, even in someone who appears to be breathing normally.
How do you manage an unconscious person with a suspected spinal injury who is still in the water?
Turn them face upward and remove them from the water immediately. Do not delay removal to apply spinal precautions, since airway and breathing take priority.
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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