Choking is the inability to breathe because the trachea is blocked, constricted, or swollen shut. Choking is a medical emergency. When a person is choking, air cannot reach the lungs. If the airways cannot be cleared, death follows rapidly.

Anyone can choke, but choking is more common in children than in adults. Choking is a common cause of accidental death in young children who are apt to put toys or coins in their mouths, then unintentionally inhale them. About 3,000 adults die each year from choking on food.

People also choke because infection causes the throat tissue to swell shut. It is believed that this is what caused George Washington's death. Allergic reactions can also cause the throat to swell shut. Acute allergic reactions are called anaphylactic reactions and may be fatal. Strangulation puts external pressure on the trachea, causing another form of choking.

Finally, people can choke from...