All Guidelines, Reports and Recommendations published by IHS are accessible below. Guidelines published by National Society Members are also available. Note: not all of these can be copied, saved or printed. 

Please note that many guidelines are in PDF format which require Acrobat Reader in order to view. You can download Acrobat Reader here.

International Classification of Headache Disorders (ICHD) (3rd Edition)

The International Classification of Headache Disorders (ICHD) is an algorithmic system to define and classify all known headache disorders. It is divided into primary headache disorders such as migraine and symptomatic headaches which are a symptom of a different disorder.

The ICHD presents classification criteria, comments and further information for headache disorders; it is revised from time to time and is now in its 3rd edition.

International Classification of Headache Disorders (ICHD) (3rd Edition) – translations

Translations of the ICHD-3 are available in several languages, translated by IHS Affiliate Member Societies.

Clinical Trials (Recommendations) Guidelines

International Classification of Orofacial Pain (ICOP) (1st Edition)

The first International Classification of Orofacial Pain (ICOP) was published in 2020, and will ensure standardised communication on all aspects of orofacial pain between professions, scientists and clinicians. By acknowledging and using such a classification we make sure that scientific progress is comparable between labs and that clinicians all over the world speak about the same disease when discussing orofacial pain.

Facial pain has been included and defined in the ICHD, but the facial pain chapter in the ICHD excludes many dental and other facial disorders and is thus incomplete. With the advent of ICOP, this has changed. As such, ICHD-3 and ICOP can be cited pari passu, but given that ICOP is more specific for facial pain it should be favoured for this purpose.

GRADE tables

Clinic-Based Headache Registries Guideline

Health Technology Assessment Position Statement

Ethical Guidelines

ICHD previous editions