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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5. HEADACHE ATTRIBUTED TO HEAD AND/OR NECK TRAUMA 6. HEADACHE ATTRIBUTED TO CRANIAL OR CERVICAL VASCULAR DISORDER 7. HEADACHE ATTRIBUTED TO NON-VASCULAR INTRACRANIAL DISORDER 8. HEADACHE ATTRIBUTED TO A SUBSTANCE OR ITS WITHDRAWAL 9. HEADACHE ATTRIBUTED TO INFECTION 10. HEADACHE ATTRIBUTED TO DISORDER OF HOMOEOSTASIS 10.1. Headache attributed to hypoxia and/or hypercapnia 10.1.1. High-altitude headache [W94] 10.1.2. Diving headache 10.1.3. Sleep apnoea headache [G47.3] 10.2. Dialysis headache [Y84.1] 10.3. Headache attributed to arterial hypertension [I10] 10.4. Headache attributed to hypothyroidism [E03.9] 10.5. Headache attributed to fasting [T73.0] 10.6. Cardiac cephalalgia [code to specify aetiology] 10.7. Headache attributed to other disorder of homoeostasis [code to specify aetiology] Bibliography11. HEADACHE OR FACIAL PAIN ATTRIBUTED TO DISORDER OF CRANIUM, NECK, EYES, EARS, NOSE, SINUSES, TEETH, MOUTH OR OTHER FACIAL OR CRANIAL STRUCTURES 12. HEADACHE ATTRIBUTED TO PSYCHIATRIC DISORDER 

IHS	Diagnosis	ICD-10
10.1.1	High-altitude headache [W94]	G44.882

Diagnostic criteria:

Headache with at least two of the following characteristics and fulfilling criteria C and D:
1. bilateral
2. frontal or frontotemporal
3. dull or pressing quality
4. mild or moderate intensity
5. aggravated by exertion, movement, straining, coughing or bending
Ascent to altitude above 2500 m
Headache develops within 24 hours after ascent
Headache resolves within 8 hours after descent

Comments:

Headache is a frequent complication of ascent to altitude - occurring in more than 80% of cases. 10.1.1 High-altitude headache appears to be independent of an individual's previous history of headache, although patients with migraine may describe more severe headache that resembles their typical migraine attacks.

Acute mountain sickness (AMS) consists of at least moderate headache combined with one or more of nausea, anorexia, fatigue, dizziness and sleep disturbances. Acetazolamide (125 mg, two or three times daily) may reduce susceptibility to acute mountain sickness. Preventative strategies include allowing two days of acclimatisation prior to engaging in strenuous exercise at high altitudes, avoiding alcohol, and liberalising fluid intake. Most high-altitude headaches respond to simple analgesics such as paracetamol (acetaminophen) or ibuprofen.

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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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