![]() Previous reports, before inclusion of AH in classification, could be based on diversity in diagnosis, which makes it difficult to determine whether reported patients suffered from AH or other conditions. ![]() ![]() The first case of AH was described in 2004, and since then, number of publications on AH has been added into the literature. Despite its occurrence rate and high impact, only limited is known about AH, and this type of headache has only been defined and included in the headache classification since 2013 by International Headache Society (IHS), which provides headache classifications and maintains related updates. The headache appears as an intense short lasting pain at landing and it is often located in the fronto-orbital region.
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