Summarize:

Find out, in their words, what happened that caused the individual to be hurt or to feel unwell.  If the victim was hurt within view of others, ask witnesses to describe what happened. Use context clues to determine what injuries the victim could have sustained. For example, if the victim fell while rock climbing, fractured bones are likely. This should include events that have before this particular incident. Once emergency responders (usually EMTs or ambulance crews) arrive on the scene, be prepared to hand over your notes to them or to verbally describe the victim’s medical history. Ask specific questions; try asking:  “Do you have any relevant allergies?” “Do you take any prescribed medications?” “Do you have any existing medical conditions that would affect this incident?” “When was the last time that you ate a meal? What did you eat?” Often injured victims will have symptoms that are not found by a simple first-aid exam. Consequently, it is valuable to hear from the victim himself what hurts or what has been injured. Ask specific questions: where does the victim feel pain? At what point did the pain start?
Ask the victim about the history of the incident. Ask the victim to tell you their personal medical history. Have the individual describe their symptoms to you.