What Is Migraine Aura?

Auras are sensory disturbances that can accompany a migraine or occur without the intense pain of the headache. Although disruptive to daily activities, auras themselves are usually harmless.

Cause

The exact cause of aura is unknown. One theory suggests that overexcited brain cells stimulate the trigeminal nerve, which branches on both sides of the head to the eyes, nose and jaw. This throbbing nerve can aggravate nearby nerves and vessels in the eyes and cause the visual aura.

Significance

Aura occurs in about 20 percent of migraines and is harmless. It can serve as a warning sign of an impending headache and a time to take abortive medications.

Visual Symptoms

Sparkling flashes of light, tunnel vision, spreading blind spots and zigzags are among the visual problems known as auras.

Other Aura Symptoms

Aura includes any sensory changes, such as smelling strange odors or hearing sounds. Some people have trouble speaking and experience changes in their sensory perceptions.

Aura without Pain

Ocular migraines are aura episodes that occur without the associated head pain. These headaches are harmless but can affect activities like driving.

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