An Introduction to Clinical Emergency Medicine is a much-needed resource for individuals practicing this challenging field. This textbook is novel in its approach to emergency medicine topics. It describes in detail the best and most current methods to care for patients in the emergency department, including initial evaluation, generation of differential diagnoses, problem solving, and management of challenging conditions based on presenting symptoms. Unlike other textbooks, in which the diagnosis is known, this textbook approaches clinical problems as clinicians manage patients – without full knowledge of the final diagnosis. It provides an understanding for how to approach patients with undifferentiated conditions, ask the right questions, gather historical data, utilize physical examination skills, and order and interpret appropriate laboratory and radiographic tests.