Remember, this is not intended as medical advice, but as a means of preparing you for emergencies. These are the most serious and life threatening emergencies you can encounter. Keeping your head and following basics until help arrives will keep you and your mates healthy. This is a life threatening emergency. You must act quickly.
Food is the most common reason for choking.
If they can speak, it means that food is NOT lodged in the windpipe. Keep asking the question until you get an answer or it is obvious the victim cannot speak. This can further lodge the object in his throat. You are going to perform The Heimlich Maneuver. It's a simple and life-saving technique that can be performed if the person is standing, sitting or lying down.