Primary vs secondary headache vs cranial neuralgias

Primary headaches: four main groups, comprising migraine, tensiontype headache, cluster headache (and other trigeminal autonomic cephalalgias); and other primary headaches (such as cough or exertional headache). • Secondary headaches: symptomatic of some underlying pathology, e.g. from raised intracranial pressure and space-occupying lesions • Trigeminal and other cranial neuralgias, and other headaches including root pain from herpes zoster.