Editing Migraine (section)

===Classification===
{{Main|ICHD classification and diagnosis of migraine}}
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Migraine was first comprehensively classified in 1988.<ref name="Olesen_2006">{{cite book| vauthors = Olesen J, Goadsby PJ | chapter = The Migraines: Introduction | veditors = Olesen J |title=The Headaches|year=2006|publisher=Lippincott Williams & Wilkins|location=Philadelphia|isbn=978-0-7817-5400-2|pages=232–233| chapter-url=https://books.google.com/books?id=F5VMlANd9iYC&pg=PA232|edition=3rd|url-status=live|archive-url=https://web.archive.org/web/20170313073938/https://books.google.com/books?id=F5VMlANd9iYC&pg=PA238|archive-date=13 March 2017}}</ref>

The [[International Headache Society]] updated their classification of headaches in 2004.<ref name=ICHD2004/> A third version was published in 2018.<ref>{{cite journal | vauthors = | title = Headache Classification Committee of the International Headache Society (IHS) The International Classification of Headache Disorders, 3rd edition | journal = Cephalalgia | volume = 38 | issue = 1 | pages = 1–211 | date = January 2018 | pmid = 29368949 | doi = 10.1177/0333102417738202 | doi-access = free | title-link = doi }}</ref> According to this classification, migraine is a primary headache disorder along with [[tension-type headache]]s and [[cluster headache]]s, among others.<ref>{{cite journal | vauthors = Nappi G | title = Introduction to the new International Classification of Headache Disorders | journal = The Journal of Headache and Pain | volume = 6 | issue = 4 | pages = 203–4 | date = September 2005 | pmid = 16362664 | pmc = 3452009 | doi = 10.1007/s10194-005-0185-y }}</ref>

Migraine is divided into six subclasses (some of which include further subdivisions):<ref>{{Cite journal |date=January 2018 |title=Headache Classification Committee of the International Headache Society (IHS) The International Classification of Headache Disorders, 3rd edition |url=http://journals.sagepub.com/doi/10.1177/0333102417738202 |journal=Cephalalgia |volume=38 |issue=1 |pages=1–211 |doi=10.1177/0333102417738202 |pmid=29368949 |issn=0333-1024}}</ref>
* ''Migraine without aura'', or "common migraine", involves migraine headaches that are not accompanied by aura.
* ''Migraine with aura'', or "classic migraine", usually involves migraine headaches accompanied by aura. Less commonly, aura can occur without a headache, or with a nonmigraine headache. Two other varieties are [[familial hemiplegic migraine]] and [[sporadic hemiplegic migraine]], in which a person has migraine with aura and with accompanying motor weakness. If a close relative has had the same condition, it is called "familial", otherwise it is called "sporadic". Another variety is basilar-type migraine, where a headache and aura are accompanied by [[dysarthria|difficulty speaking]], [[Vertigo (medical)|world spinning]], [[tinnitus|ringing in ears]], or a number of other brainstem-related symptoms, but not motor weakness. This type was initially believed to be due to spasms of the [[basilar artery]], the artery that supplies the brainstem. Now that this mechanism is not believed to be primary, the symptomatic term [[ICHD classification and diagnosis of migraine#Migraine with brainstem aura|migraine with brainstem aura (MBA)]] is preferred.<ref name=Basil2009/> [[Retinal migraine]] (which is distinct from visual or optical migraine) involves migraine headaches accompanied by visual disturbances or even temporary blindness in one eye.
* Childhood periodic syndromes that are commonly precursors of migraine include [[cyclical vomiting syndrome|cyclical vomiting]] (occasional intense periods of vomiting), [[abdominal migraine]] (abdominal pain, usually accompanied by nausea), and [[benign paroxysmal vertigo of childhood]] (occasional attacks of vertigo).
* ''Complications of migraine'' describe migraine headaches and/or auras that are unusually long or unusually frequent, or associated with a seizure or brain lesion.
* ''Probable migraine'' describes conditions that have some characteristics of migraine, but where there is not enough evidence to diagnose it as migraine with certainty (in the presence of concurrent medication overuse).
* ''Chronic migraine'' is a complication of migraine, and is a headache that fulfills diagnostic criteria for ''migraine headache'' and occurs for a greater time interval. Specifically, greater or equal to 15 days/month for longer than 3 months.<ref>{{cite journal | vauthors = Negro A, Rocchietti-March M, Fiorillo M, Martelletti P | title = Chronic migraine: current concepts and ongoing treatments | journal = European Review for Medical and Pharmacological Sciences | volume = 15 | issue = 12 | pages = 1401–20 | date = December 2011 | pmid = 22288302 }}</ref>