In migraine with aura, formerly called classical migraine, the headache phase is preceded or accompanied by a group of specific symptoms called aura, most commonly experienced as a visual disturbance prior to the attack. Aura usually lasts less than 60 minutes, and in those who suffer migraine with aura there is generally little time between the onset of aura and the onset of the attack. Migraine without aura, formerly called common migraine, in contrast to migraine with aura, lacks any manifestations associated with headache. Some experience aura without migraine, a condition formerly called amigrainous migraine or optical migraine, now usually called acephalgic migraine. Although sometimes comparable in severity, the symptoms of migraine differ from those of cluster headache.
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