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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 10.2. 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
10.5	Headache attributed to fasting [T73.0]	G44.882
Coded elsewhere	Hypoglycaemia-induced migraine is coded according to subtype under 1. Migraine , with hypoglycaemia considered as a precipitating factor.

Diagnostic criteria:

Headache with at least one of the following characteristics and fulfilling criteria C and D:
1. frontal location
2. diffuse pain
3. non-pulsating quality
4. mild or moderate intensity
The patient has fasted for >16 hours
Headache develops during fasting
Headache resolves within 72 hours after resumption of food intake

Comments:

Headache with fasting is significantly more common in individuals with a prior history of headache. In those individuals with a prior history of migraine, the headache may resemble 1.1 Migraine without aura.

The likelihood of headache developing as a result of a fast increases with the duration of the fast.

The headache associated with fasting does not appear to be related to duration of sleep, to caffeine withdrawal or to hypoglycaemia. Although headache may occur under conditions of hypoglycaemia-induced brain dysfunction, there is no conclusive evidence to support a causal association. Fasting headache can occur in the absence of hypoglycaemia, insulin-induced hypoglycaemia does not precipitate headache in migraine sufferers, and headache is not a complaint of patients presenting to the emergency department with symptomatic hypoglycaemia. Well-controlled studies are needed to demonstrate a causal relationship, if one exists.

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IHS vs. ICD-10

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