What causes Migraine?

The precise cause of migraines is unknown. Among the suspected causes are:

• Environmental triggers
• Genetic predisposition
• Dietary triggers
• Physiologic (menstruation, puberty)

An internal or external trigger sets the process in motion. It is possible that the nervous system reacts to the trigger by conducting electrical activity that spreads across the brain. This electrical activity leads to the release of brain chemicals that make blood vessels swell and become leaky. Scientists think that it is this inflammatory process that causes the pain and other symptoms of a migraine headache.