Sudden airway obstruction, or choking, may be either mild (partial) or severe (complete).
Choking can happen to anyone at any time. Knowing how to provide appropriate first aid can avert a potentially life threatening situation.
Mild obstruction
If the obstruction is mild, breathing may be noisy and the casualty may be able to cough or speak. In such cases, encourage coughing and seek medical assistance.
Severe obstruction
If the obstruction is severe the casualty will soon become unconscious. Be aware that severe airway obstruction is silent as there is no movement of air to allow for speaking or breathing.