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, organised and hosted on behalf of IHS by a member national society.