See Heimlich maneuver for first aid for choking . High altitudes can cause breathing problems, even in young people. Direct trauma to the neck or chest can cause breathing problems.
Internal injuries are often more severe than they look.
DO NOT place a pillow under the victim's head if he or she is lying down. This can close the airway. DO NOT place the victim in an uncomfortable position. DO NOT wait to see if the victim's condition improves before getting medical help. Get help now.