A migraine aura is a warning sign of an oncoming migraine headache. An aura develops gradually, usually within 30 minutes before a migraine headache starts, and consists of visual disturbances and physical sensations.
Not everyone who suffers from migraines develops an aura. For those who do, common symptoms of a migraine aura include:
Other, less common symptoms of a migraine aura can occur, including:
WebMD Medical Reference from Healthwise