RT Book, Section A1 Schwartz, Daniel P. A1 Sollars, Mark A1 Grosberg, Brian M. A2 Bajwa, Zahid H. A2 Wootton, R. Joshua A2 Warfield, Carol A. SR Print(0) ID 1131932461 T1 Epidemiology of Headaches T2 Principles and Practice of Pain Medicine, 3e YR 2016 FD 2016 PB McGraw-Hill Education PP New York, NY SN 9780071766838 LK accessanesthesiology.mhmedical.com/content.aspx?aid=1131932461 RD 2024/03/28 AB Headache is a common pain symptom that inflicts a substantial burden on individuals and on society. Headache has many causes; a range of headache diagnoses was defined for the first time by the International Headache Society (IHS) in 1988 in the first edition of the International Classification of Headache Disorders (ICHD-1).1 The second edition of the International Classification of Headache Disorders (ICHD-2) was published by the IHS in 2004, and the third edition (ICHD-3 beta version) was published in 2013.2,3 The ICHD-3 beta version classifies headache disorders into three major categories: (1) primary headaches; (2) secondary headaches; and (3) painful cranial neuropathies, other facial pains, and other headaches. Secondary headache disorders result from an underlying condition, such as a sinus infection or brain tumor. In primary headache disorders, the headache disorder is the fundamental problem. The primary headaches include four categories: migraine, tension-type headache (TTH), trigeminal autonomic cephalalgias (TACs), and other primary headache disorders. The two most common types of primary headache disorders are episodic tension-type headache (ETTH) and migraine.