International Headache Society
It has over 1,000 ordinary members (including national society members). The society publishes an international journal Cephalalgia. The society was incorporated in 1994 in England and Wales as a Company Limited by Guarantee and registered in 1995 as a charity.
International Headache Congress
The International Headache Congress (IHC) is held every second year, organized and hosted on behalf of IHS by a member national society.
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