an aura is a warning sign that a migraine is about to begin. an aura usually occurs about 10 to 30 minutes before the onset of a migraine although it can occur as early as the night before the onset. the most common auras are visual and include blurred or distorted vision; blind spots; or brightly colored flashing or moving lights or lines. other auras may include speech disturbances motor weakness or sensory changes. the duration of an aura varies but it generally lasts less than 20 minutes.
what is an aura related to migraines?