What causes migraine headaches?

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Answers:
"The pain of migraine occurs when excited brain cells trigger the trigeminal nerve to release chemicals that irritate and cause swelling of blood vessels on the surface of the brain. These swollen blood vessels send pain signals to the brainstem, an area of the brain that processes pain information. The pain of migraine is a "referred" pain that is typically felt around the eye or temple area. Pain can also occur in the face, sinus, jaw or neck area. Once the attack is full-blown, many people will be sensitive to anything touching their head. Activities such as combing their hair or shaving may be painful or unpleasant." Source: National Headache Foundation - © Copyright 2005, National Headache Foundation

Other Answers:
it is the glasses you have on.

Not all scientists agree about what causes migraines. Many believe that a migraine is caused by narrowing and expanding of the blood vessels in the brain. There are also theories that the level of certain chemicals in the brain may affect the nerve system that regulates pain.
Source(s):
http://www.kidshealth.org/teen/diseases_conditions/brain_nervous/migraines.html

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What causes migraine headaches?

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