What is an aura and when does it occur?

An aura is a neurological phenomenon that occurs before a migraine headache, primarily characterized by visual disturbances or other sensory changes. This stage typically precedes the pain phase of a migraine and can include symptoms such as flashing lights, zigzag patterns, or even temporary loss of vision. These disturbances can last anywhere from a few minutes to about an hour, signaling that a migraine is imminent.

In this context, visual disturbances are the hallmark of an aura, making it a critical indicator for individuals who experience migraines. Understanding this can help in recognizing migraine triggers and potentially seeking timely intervention to mitigate the severity of the headache. The other options describe aspects related to migraines, but they do not capture the essence of what an aura is or when it occurs in the migraine cycle.