Migraines are painful headache episodes, sometimes accompanied by visual and sensory disturbances, which are caused by chemical, electrical, and vascular changes in the brain. They can last up to three days and frequently incapacitate the sufferer.
Migraine is classified by two major types – migraine with aura and without aura. An aura is a group of changes that proceed a migraine headache, including visual, sensory, and cognitive changes. Both types of migraine have a duration of roughly four to seventy hours and a one-sided, pulsating headache that worsens with even light physical activity.