The available literature on headache disorders is sizeable. A literature search was performed using PubMed online with the following search terms: emergency headache, emergency migraine, emergency tension headache, and migraine treatment. Approximately 2400 articles from 1960 to present were reviewed. The National Guideline Clearinghouse (www.guideline.gov) and the Cochrane Database of Systematic Reviews were searched with the term headache and included 7 and 15 review articles, respectively...
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