Home Introduction Prefaces Introduction to the classification How to Use This Classification Subcommittees and working groups The Classification Table of contents Part I: The primary headaches Part II: The secondary headaches Part III: Cranial neuralgias, facial pain and other headaches Appendix Definition of Terms

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1. MIGRAINE 2. TENSION-TYPE HEADACHE (TTH) 3. CLUSTER HEADACHE AND OTHER TRIGEMINAL AUTONOMIC CEPHALALGIAS 3.1. Cluster headache 3.2. Paroxysmal hemicrania 3.3. Short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing (SUNCT) 3.4. Probable trigeminal autonomic cephalalgia References4. OTHER PRIMARY HEADACHES 

IHS	Diagnosis	ICD-10
3	CLUSTER HEADACHE AND OTHER TRIGEMINAL AUTONOMIC CEPHALALGIAS	G44.0
Coded elsewhere	4.7 Hemicrania continua

General comment

Primary or secondary headache or both?

When a headache with the characteristics of a trigeminal autonomic cephalalgia (TAC) occurs for the first time in close temporal relation to another disorder that is a known cause of headache, it is coded according to the causative disorder as a secondary headache. When a pre-existing TAC is made worse in close temporal relation to another disorder that is a known cause of headache, there are two possibilities, and judgment is required. The patient can either be given only the TAC diagnosis or be given both the TAC diagnosis and a secondary headache diagnosis according to the other disorder. Factors that support adding the latter diagnosis are: a very close temporal relation to the disorder, a marked worsening of the TAC, very good evidence that the disorder can cause or aggravate the TAC and, finally, improvement or resolution of the TAC after relief from the disorder.

Introduction

The trigeminal autonomic cephalalgias share the clinical features of headache and prominent cranial parasympathetic autonomic features. Experimental and human functional imaging suggests that these syndromes activate a normal human trigeminal-parasympathetic reflex with clinical signs of cranial sympathetic dysfunction being secondary. Hemicrania continua, whose cranial autonomic features are less constant, is to be found under 4. Other primary headaches.

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IHS vs. ICD-10

To facilitate headache diagnosis in daily practice, the classification provides the corresponding WHO ICD-10NA codes for each IHS code.

IHS Subcommittee

The Classification Subcommittee prepares and revises the International Classification of Headache Disorders.

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Cephalalgia

Cephalalgia is the official journal of the IHS. It contains original papers on all aspects of headache. The journal provides an international forum for original research papers, review articles and short communications.www.cephalalgia.org

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