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Hemicrania Continua Should NOT Be Classified as a Trigeminal Autonomic Cephalalgia

The pain of the so‐called functional or primary headache disorders, such as tension headache, migraine, or cluster headache, can be associated with autonomic symptoms that are localized in nature. The localized autonomic symptoms probably involve higher centers of autonomic regulation, for example the hypothalamus, for which there is support from functional magnetic resonance imaging studies.