Migraine is a type of recurring headache that involves blood vessels, nerves, and brain chemicals. Sensations such as visual changes, called auras, may precede a migraine.
The International Headache Society developed a system that classifies migraines as one of two types: migraine occurring with an aura (formerly called “classic”), and migraine occurring without an aura (formerly called “common”). People suffering from migraines may experience a migraine several times a week or once every couple of years. Migraines may be so severe that they interfere with a person’s ability to work and carry on normal activities.
The precise cause of migraines is unknown. Among the suspected causes are environmental triggers, genetic predisposition, dietary triggers, physiological triggers such as menstruation.
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.
Migraine headache symptoms are face numb, yawning and fear of noise.