- assessment of a child with a headache is mainly clinical - radiological imaging is rarely required
 - history of the headache should assess:   
- nature and quality of pain
 - intensity of pain
 - site and spread of pain
 - frequency and duration of headache
 - associated symptoms
 - trigger or predisposing factors
 - aggravating and relieving factors
 
 - ideally a full neurological examination should be undertaken - including visual field testing and fundoscopy
 - growth, blood pressure and visual acuity should be assessed
 
In general, neurological examination and investigations reveal no abnormalities in children with migraine (1).
Indications for imaging include:
- abnormal neurological findings - especially if accompanied by nystagmus, papilloedema or gait or motor abnormalities
 - headaches that repeatedly wake a child from sleep or occur immediately on awakening
 - persistent headache associated with substantial episodes of confusion, vomiting or disorientation
 - also "imaging is also probably worth carrying out in children whose symptoms develop before the age of 5 years "
 
Note: migraine is approximately 50% more likely in relatives of people with the condition than in those whose relatives do not have migraine.
Reference:
- Szperka C. Headache in Children and Adolescents. Continuum (Minneap Minn). 2021 Jun 01;27(3):703-731.