In general, there's thought to be a link between Migraine disease and epilepsy, but that link is not well understood yet. It seems to be related to electrical activity of the brain.
More specifically, Migraines can sometimes trigger seizures. Here's the diagnostic criteria for this from the International Headache Society:
1.5.5 Migraine-triggered seizure
Description: A seizure triggered by a migraine aura.
A. Migraine fulfilling criteria for 1.2 Migraine with aura
B. Aseizure fulfilling diagnostic criteria for one type of epileptic attack occurs during or within 1 hour after a migraine aura
Migraine and epilepsy are prototypical examples of paroxysmal brain disorders. While migraine-like headaches are quite frequently seen in the postictal period, sometimes a seizure occurs during or following a migraine attack. This phenomenon, sometimes referred to as migralepsy, has been described in patients with migraine with aura.
I hope this helps,
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