TY - CHAP M1 - Book, Section TI - Headache & Facial Pain A1 - Greenberg, David A. A1 - Aminoff, Michael J. A1 - Simon, Roger P. PY - 2021 T2 - Clinical Neurology, 11e AB - Headache occurs in all age groups and accounts for 1-2% of emergency department evaluations and up to 4% of medical office visits; the causes are myriad (Table 6-1). Although most often a benign condition (especially when chronic and recurrent), headache of new onset may be the earliest or the principal manifestation of serious systemic or intracranial disease and therefore requires thorough and systematic evaluation. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - neurology.mhmedical.com/content.aspx?aid=1182389764 ER -