The migraine aura phase involves the occurrence of one or more fully reversible focal neurological symptoms.
It is experienced by about 20% of migraine sufferers although not all patients with Migraine with Aura will experience the aura symptoms with every attack.
This phase occurs just before the headache phase begins but in some patients the migraine aura phase can overlap with the later headache phase.
Aura usually develops over five to twenty minutes and lasts for up to one hour. Aura symptoms are most commonly visual, though they can also be sensory or, more rarely, motor.
- Scintillation scotomas, e.g.
- Bright rim around an area of visual loss (fortification spectra)
- Flashing lights
- Jagged lines that block the visual field
- Visual resizing or reshaping of objects
- Blurred vision
- Unilateral sensory parasthesia that usually begins as numbness in the hand and migrates up the arm before moving into the face, lips and tongue
- Muscular weakness
- Partial paralysis on one side of the body
- Temporary dysphasia