Emergency Meicine is a speciality of medicine that focuses on diagnosis and treatment of acute illnesses and injuries that require immediate medical attention. While not usually providing long-term or continuous care, emergency medicine physicians diagnose a wide array of pathology and undertake acute interventions to stabilize the patient. These professionals practice in hospital emergency departments, in the prehospital setting via emergency medical service and other locations where initial medical treatment of illness takes place. Just as clinicians operate by immediacy rules under large emergency systems, emergency practioniers aim to diagnose emergent conditions and stabilize the patient for definitive care.