Incidence of<unk>  has been estimated at 43 per 100,000 people every year. Approximately 75% are attributed to "primary" headaches: headache disorder, non-specific headache, idiopathic<unk>  or uncertain headache disorder. The remainder is attributed to secondary causes: vascular problems, infections and various other conditions.
Thunderclap headache
External compression headache
Cold-stimulus headache
Ictal headache
Tension headache
Lupus headache
Vascular headache
Cluster headache