RT Book, Section A1 Koyfman, Alex A1 Long, Brit A2 Tintinalli, Judith E. A2 Ma, O. John A2 Yealy, Donald M. A2 Meckler, Garth D. A2 Stapczynski, J. Stephan A2 Cline, David M. A2 Thomas, Stephen H. SR Print(0) ID 1186438173 T1 Headache T2 Tintinalli's Emergency Medicine: A Comprehensive Study Guide, 9e YR 2020 FD 2020 PB McGraw-Hill Education PP New York, NY SN 9781260019933 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1186438173 RD 2023/06/07 AB Headache is the fourth most common symptom presenting to the ED in the United States, accounting for close to 3% of total ED visits.1 Overall, headaches affect people across all ethnic, geographic, and economic levels, with an estimated global prevalence of 47% in adults.2