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 P:What provoked the pain or what was the patient doing when the pain started?

 Q:What is the quality of the pain; burning, aching, squeezing, or stabbing?

 R:Is there any radiation of the pain; does it go to the neck, jaw, arm, or back?

 S:How severe is the pain? On a scale of 1 to 10, with 10 being the worst pain in one’s life, what is the pain now, and how has it changed?

 T:What are the temporal aspects of the pain? How long has it been present? Has it occurred before? When?

There are many causes of chest pain, and their incidence changes depending on the characteristics of the population being studied. Patients calling on EMS are more likely to have acute myocardial infarction or other serious causes of chest pain than are patients in the general ED population [3]. Although the majority of this chapter focuses on the management of an ACS, other causes of chest pain are present more commonly.