What causes aura?

Migraine FAQs: What causes aura?

When migraine sufferers undergo MRI (magnetic resonance imaging) during aura, in certain patients, the changes in the brain (officially called a cortical spreading depression) can be seen slowly moving across part of the brain.

Migraine symptoms

It is thought that auras are caused by a wave of nerve signals or impulses that move across the brain, causing a disruption in normal activity in those parts of the brain.

These changes are thought to cause the changes in vision or feelings of numbness.

By providing your email address, you are agreeing to our privacy policy. We never sell or share your email address.