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1. MIGRAINE 2. TENSION-TYPE HEADACHE (TTH) 3. CLUSTER HEADACHE AND OTHER TRIGEMINAL AUTONOMIC CEPHALALGIAS 4. OTHER PRIMARY HEADACHES 4.2. Primary cough headache 4.3. Primary exertional headache 4.4. Primary headache associated with sexual activity 4.5. Hypnic headache 4.6. Primary thunderclap headache 4.7. Hemicrania continua 4.8. New daily-persistent headache (NDPH) Bibliography

IHS	Diagnosis	ICD-10
4.7	Hemicrania continua	G44.80

Description:

Persistent strictly unilateral headache responsive to indomethacin.

Diagnostic criteria:

Headache for >3 months fulfilling criteria B-D
All of the following characteristics:
1. unilateral pain without side-shift
2. daily and continuous, without pain-free periods
3. moderate intensity, but with exacerbations of severe pain
At least one of the following autonomic features occurs during exacerbations and ipsilateral to the side of pain:
1. conjunctival injection and/or lacrimation
2. nasal congestion and/or rhinorrhoea
3. ptosis and/or miosis
Complete response to therapeutic doses of indomethacin
Not attributed to another disorder¹

Note:

History and physical and neurological examinations do not suggest any of the disorders listed in groups 5-12, or history and/or physical and/or neurological examinations do suggest such disorder but it is ruled out by appropriate investigations, or such disorder is present but headache does not occur for the first time in close temporal relation to the disorder

Comment:

Hemicrania continua is usually unremitting, but rare cases of remission are reported. Whether this headache type can be subdivided according to length of history and persistence is yet to be determined.

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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

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