migraine

n. severe recurrent headache

Migraine is a neurological disease best known for severe headaches that are its most salient symptom.
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Migraine /mi·graine/ a symptom complex of periodic headaches, usually temporal and unilateral, often with irritability, nausea, vomiting, [more]Migraine - Community and Resources

Noun
1. a severe recurring vascular headache; occurs more frequently in women than men
(synonym) megrim, sick headache, hemicrania
(hypernym) headache, head ache, cephalalgia

n. migraine, severe recurrent headache