[Trigeminal autonomic headache, hemicrania continua and hypnic headache. A review of rare primary headache forms].

Tension-type headache and migraine are the most common types of primary headaches. Apart from these well known diseases, the group of primary headaches includes other relatively rare headache disorders. Some of these seldom syndromes have been described for the first time within the last twenty years and have been newly included in the revised IHS classification from 2004. Their typical symptomatic is less known, but offers an excellent opportunity to diagnose these syndromes. The importance of recognising these disorders is underlined by the fact, that rare primary headaches response often complete and rapid to a specific treatment. This review summarizes the current knowledge on the clinical presentation and treatment of cluster headache, paroxysmal hemicrania, SUNCT syndrome, hemicrania continua and hypnic headache.