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5. HEADACHE ATTRIBUTED TO HEAD AND/OR NECK TRAUMA 5.1. Acute post-traumatic headache5.2. Chronic post-traumatic headache 5.2.1. Chronic post-traumatic headache attributed to moderate or severe head injury [S06] 5.2.2. Chronic post-traumatic headache attributed to mild head injury [S09.9] 5.3. Acute headache attributed to whiplash injury [S13.4] 5.4. Chronic headache attributed to whiplash injury [S13.4] 5.5. Headache attributed to traumatic intracranial haematoma 5.6. Headache attributed to other head and/or neck trauma [S06]5.7. Post-craniotomy headacheBibliography6. 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 11. 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
5.2.2	Chronic post-traumatic headache attributed to mild head injury [S09.9]	G44.31

Diagnostic criteria:

Headache, no typical characteristics known, fulfilling criteria C and D
Head trauma with all the following:
1. either no loss of consciousness, or loss of consciousness of <30 minutes' duration
2. Glasgow Coma Scale (GCS) ≥13
3. symptoms and/or signs diagnostic of concussion
Headache develops within 7 days after head trauma
Headache persists for >3 months after head trauma

Comment:

Mild head injury may give rise to a symptom complex of cognitive, behavioural and consciousness abnormalities and a GCS of ≥13. It can occur with or without abnormalities in the neurological examination, neuroimaging (CT scan, MRI), EEG, evoked potentials, CSF examination, vestibular function tests and neuropsychological testing. There is no evidence that an abnormality in any of these changes the prognosis or contributes to treatment. These studies should not be considered routine for patients with ongoing post-traumatic headache. They may be considered on a case-by-case basis, or for research purposes.

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