Smothering, gagging and choking
- Finding
Smothering covers the nose and mouth; choking blocks the airway from inside. Both may leave almost no signs.
What it is
Smothering is occlusion of the nose and mouth from outside: with a hand, a pillow, a plastic bag or bedding. Gagging is obstruction by an object inside the mouth, which can slip back into the pharynx. Choking is internal airway obstruction by a foreign body or a food bolus, almost always accidental, in small children, older people, intoxicated people or those with swallowing disorders. Smothering of an infant or a weak person may leave no findings at all, so the scene and the history are decisive.
How to tell it apart
- Versus sudden infant death: the autopsy may be identical; the scene, the history and the sleep reconstruction decide.
- Versus agonal aspiration of gastric contents: vomit in the airway is common at death and does not prove choking.
- Versus myocardial infarction: obstruction by a bolus is sudden during a meal, with inability to speak.
- Resuscitation injuries to the mouth and nose can be confused with smothering injuries.
How to recognise it
- Injuries around the nose and mouth: abrasions, bruises, nail marks.
- Bruises or lacerations of the inner lips from pressure against the teeth.
- Fibres, feathers or remnants of the pillow or fabric in the mouth or nose.
- Plastic bag over the head: may leave no mark at all.
- Choking: a foreign body or food bolus lodged in the larynx, glottis or trachea.
How it forms
- Occlusion of the openings or the airway causes hypoxia and hypercapnia and leads to cardiac arrest.
- Stimulation of the larynx by a foreign body can cause a very rapid reflex arrest, without signs of asphyxia.
- Weak or unconscious victims do not struggle, so injuries are absent.
Next step: what to do and document
- Document the body's position, the bedding, the bag or gag as found, before moving them.
- Examine and describe the nose, mouth, inner lips and gums; photograph with a scale.
- Record every resuscitation attempt and who made it, so it is not confused with injury.
- Keep the bag, gag or foreign body with a chain of custody; notify the judicial police of every infant death without a clear cause.
- If child maltreatment is suspected, report it and activate the protection pathway.
Common mistakes
- Concluding a natural death in an infant without investigating the sleep scene.
- Reading gastric contents aspirated at death or during resuscitation as choking.
- Not examining the inner lips and gums.
- Removing the bag, pillow or gag without photographing and keeping it.
Test yourself
Think of the answer, then tap the question to see it.
Can the autopsy tell infant smothering from sudden infant death?
Often not: both can have an autopsy without findings. The scene investigation, the history and the sleep reconstruction decide.
Which mouth injury should be looked for when smothering by hand is suspected?
Bruises and lacerations of the inner lips from pressure against the teeth, plus abrasions around the nose and mouth.
Do gastric contents in the trachea prove death by choking?
No. Aspiration of vomit is common in the agonal phase and during resuscitation; an obstructing foreign body and a matching history are needed.
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Educational content on forensic and legal medicine; not legal advice and no substitute for the technical guides of Colombia's National Institute of Legal Medicine and Forensic Sciences. Laws change: each page links the official text and says when it was last checked. For a real case, follow the guide in force and ask the competent authority.
Sources: A Fresh Look at the History of SIDS (Academic Forensic Pathology, PubMed Central, 2017); Sudden deaths from positional asphyxia: a case report (Medicine (Baltimore), PubMed Central, 2018).
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