Cephalalgia : an international journal of headache
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Data on clinical differences between episodic (eCH) and chronic cluster headache (cCH) and accompanying migraine features are limited. ⋯ Occurrence of CAS and attack frequency, as well as periodic patterns of attacks, are relatively uniform in eCH and cCH. Multiple CAS are not related to pain intensity. Allodynia during cluster attacks is a frequent symptom. The unexpectedly high rate of accompanying migrainous features during cluster attacks cannot be explained by comorbid migraine.