health:MEDICAL EMERGENCIES

Medical problems and emergencies you may be faced with include
breathing problems, severe bleeding, and shock.
Breathing Problems
Any one of the following can cause airway obstruction, resulting in
stopped breathing
Foreign matter in mouth of throat that obstructs the opening to the
trachea.
Face or neck injuries.
Inflammation and swelling of mouth and throat caused by inhaling
smoke, flames, and irritating vapors or by an allergic reaction.
“Kink” in the throat (caused by the neck bent forward so that the
chin rests upon the chest) may block the passage of air.
Tongue blocks passage of air to the lungs upon unconsciousness.
When an individual is unconscious, the muscles of the lower jaw and
tongue relax as the neck drops forward, causing the lower jaw to sag
and the tongue to drop back and block the passage of air.