TY - CHAP M1 - Book, Section TI - Headache 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. PY - 2016 T2 - Tintinalli’s Emergency Medicine: A Comprehensive Study Guide, 8e 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 SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accessmedicine.mhmedical.com/content.aspx?aid=1121499085 ER -