RT Book, Section A1 Harrigan, Michael A1 Felix, Ana C. G. A2 Tintinalli, Judith E. A2 Stapczynski, J. Stephan A2 Ma, O. John A2 Yealy, Donald M. A2 Meckler, Garth D. A2 Cline, David M. SR Print(0) ID 1121499085 T1 Headache T2 Tintinalli’s Emergency Medicine: A Comprehensive Study Guide, 8e YR 2016 FD 2016 PB McGraw-Hill Education PP New York, NY SN 9780071794763 LK accessmedicine.mhmedical.com/content.aspx?aid=1121499085 RD 2024/04/24 AB Headache is the fifth most common symptom presenting to the ED in the United States, with a total of 2.1 million visits per year.1 Overall, headaches affect people across all ethnic, geographic, and economic levels, with an estimated global prevalence of 47% in adults.2