Auras are warning signs the body gives a sufferer of migraine headaches just before a migraine attack begins. About twenty per cent (20%) of people who suffer from migraine headaches will have an aura about 20 minutes to an hour before the pain. Migraine auras usually occurs within an hour before head pain begins and generally lasts less than 60 minutes. Sometimes migraine aura occurs with little or no headache, especially in people age 50 and older.
They may see flashing lights, wavy lines, or dots, or they may have blurry vision or blind spots; even tingling in the hand or face. These are called "classic migraine headaches."
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References
WebMD. A slideshow guide to migraine headaches. "Migraine with Aura." https://www.webmd.com/migraines-headaches/ss/slideshow-migraine-overview
Mayo Clinic. Migraine with Aura. https://www.mayoclinic.org/diseases-conditions/migraine-with-aura/symptoms-causes/syc-20352072
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