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There are a number of atypical types of headaches which are chronic or recurring, some of which are difficult to diagnose even for specialists. This registry is aimed at the diagnosis and treatment of these conditions, including:

•    Cluster headache (Hortons huvudvärk)
•    Paroxysmal hemikrani 
•    SUNCT and SUNA headaches
•    Hemicrania continua (continuous headache)

In addition, migraines with and without aura are registered as tension headaches when they occur together with other rare types of headaches. 

-To follow treatment
-To gather data for clinical research
-To evaluate function