There are different causes for migraine headaches. Some food additives like msg(monosodium glutamate), yeast, and artificial colorants may cause a variety of physiological responses including migraine headache, fatigue, dizziness, rash, itching, and irritability. Also drugs and alcohol use can trigger an episode of migraines. For years, I suffered with debilitating migraine headaches until I discovered the culprit was the birth control pills I was taking. Once I stopped taking them, my migraines subsided.