Primary headaches

Secondary headaches

Headache duration > 4 hours (with or without medication overuse) Chronic (transformed) migraine Chronic tension-type headache New daily persistent headache Hemicrania continua Headache duration < 4 hours Strictly unilateral—prominent autonomic features Cluster headache Paroxysmal hemicrania* Unilateral or bilateral—no autonomic features Trigeminal neuralgia Idiopathic stabbing headache Cough headache Benign exertional headache Headache associated with sexual activity

Headache associated with vascular disorders Arteriovenous malformation Giant cell arteritis Carotid dissection Vasculitis Headache associated with nonvascular intracranial disorders Neoplasm Idiopathic intracranial hypertension (pseudotumor cerebri) Infection Post-traumatic headache Subdural hematoma Myofascial pain Cervical spine disorders Temporomandibular joint dysfunction Headache caused by sleep disorders Obstructive sleep apnea