Identification

Migraines are severe headaches caused by abnormal brain activity. Migraines sometimes come with warning symptoms called focal neurological signs or auras. These warnings include tunnel vision, visual field disturbances like zig zag lines or halos, sensitivity to light, blurred vision and visual hallucinations.

Types

There are two types of migraines: those with and those without focal neurological signs. Focal neurological signs warn sufferers of an impending headache. Most migraine sufferers get headaches with no advance focal neurological signs.

Theories/Speculation

The cause of focal neurological signs is not known, but they may be a result of abnormal electrical activity spreading through the brain in waves. Migraine triggers include allergies, hormone changes, stress and changes in weather.

Prevention/Solution

Migraine sufferers who have focal neurological signs can often prevent the oncoming headache by taking prescription medication. Once the headache part of a migraine hits, the pain is harder to relieve.

Expert Insight

For unknown reasons, women who get migraines with focal neurological signs have an increased risk of stroke. Anyone struggling with migraines should see a physician for testing and treatment.

Source:

New York Times Health Guide: Migraine with Aura

MayoClinic.com: Migraine with aura

Medline Plus: Migraine

More Information:

PubMed: Headache with focal neurological signs or symptoms