Table 1: International Classification of Headache Disorder (ICHD).

Part I: the primary headaches

 (1) Migraine—with or without aura
 (2) Tension-type headaches
 (3) Cluster headache and other trigeminal autonomic cephalalgias
 (4) Other primary headaches

Part II: the secondary headaches

 (1) Headache attributed to head and/or neck trauma such as domestic violence, MVA
 (2) Headache attributed to cranial or cervical vascular disorder—hypertension, subarachnoid haemorrhage
 (3) Headache attributed to nonvascular intracranial disorder—raised intracranial pressure, meningitis
 (4) Headache attributed to a substance or its withdrawal—illicit drug use such as cocaine, alcohol or medication overuse headache
 (5) Headache attributed to infections
 (6) Headache attributed to disorder of homeostasis—hypoglycaemia, hypoxia
 (7) Headache or facial pain attributed to disorder of cranium, neck, eyes, ears, nose, sinuses, teeth, mouth or other facial
  or cranial structures—trigeminal neuralgia, Bell’s palsy
 (8) Headache attributed to psychiatric disorder

Part III: Cranial neuralgias central and primary facial pain and other headaches

 (1) Cranial neuralgias and central causes of facial pain
 (2) Other headache, cranial neuralgia, central or primary facial pain