国こく際さい頭ず痛つう学がっ会かいMeaningsNoun1. Congress of the International Headache Society; IHC; International Headache Society; IHSKanji used国country際edge頭head痛pain学study会meetingComposed of国こく際さいinternationalNo-adjective頭ず痛つうheadacheNoun学がっ会かいlearned society; scientific society; academy; academic meeting; academic conferenceNoun