Shock
What exactly is shock? Well, shock is when you are put is some situation where you body stops functioning for a while. Hearing bad news, getting in an auto accident, getting a bad cut, can all lead to shock. Shock happens when your body forgets to send enough blood to your head, leaving you dizzy, confused or can even lead to fainting.
Symptoms: The victim may be weak, his face may be pale, cold and clammy. Some victims may be mad or hysterical. These are all symptoms of shock.
First Aid: Have the victim lie down and raise his feet six inches, to get blood to his head. Cover the victim if he is cold and let him sip water if he is conscious. Never leave the victim alone. Talk with the victim and assure him that everyhing will be fine. The main thing is to get blood to the head by raising the feet and keeping the victim calm.
Prevention: To my knowldge there is nothing you can do to prevent shock.